Answer:
Approximately 12,500 SARS-CoV-2 viruses
Explanation:
According to this question, the period described is 1mm in diameter. Since 1millimetre(mm) is 1000metre(m), this means that the period is 0.001m in diameter.
Also, the SARS-CoV-2 virus has a diameter of 80 nm (1nm = 10^9m).
Since 10^6nanometres (nm) or 1,000,000nm makes 1millimeter (mm), 80nm of the virus will be:
= 80/1,000,000
= 0.000080mm or 8 × 10^-5mm
To calculate how many of the SARS-CoV-2 virus will fit into the period, we divide the diameter of the period (in mm) by the diameter of the virus (in mm).
That is; 1 ÷ 8 × 10^-5
= 1/8 × 10^5
= 0.125 × 100,000
= 12,500
Therefore, approximately 12500 SARS-CoV-2 viruses will fit in the period.
Carbohydrates are more easily metabolized than lipids. However, on a gram-for-gram basis lipids provide cells with more __________.
Answer:
Energy
Explanation:
In the crystal matrix of ordinary salt, the sodium and chlorine are held together by:_______
A. peptide bonds.
B. covalent bonds.
C. ionic bonds.
D. hydrogen bonds.
E. nonpolar bonds.
Answer:
C. ionic bonds
Explanation:
In the crystal matrix of ordinary salt, the sodium and chlorine are held together by: ionic bonds.
Ionic compounds result from electrostatic interactions between ions, which often results from the net transfer of one or more electrons from one atom or group of atoms to another, that is, it is the attraction of oppositely charged ions (cations and anions) in large numbers to form a solid. .
Sodium chloride is an ionic compound made up of family 1 sodium metal and the nonmetal chlorine.
When sodium gives up its valence electron, the positively charged sodium ion is produced; chlorine accepts this electron and the negatively charged chlorine ion is formed.
The two ions have 8 electrons in their outer shell and attract each other, as they have opposite charges. The resulting compound is electrically neutral, that is, it has no charge.
Ionic compounds are crystalline solids, soluble in water, and conduct electricity when molten or in solution. These characteristics are due to the type of bond that holds them together.
Therefore, we can conclude that common salt is an ionic compound because it is made up of cations and anions, where the sodium and chlorine are held together by ionic bonds.
Learn more here: https://brainly.com/question/1053182
Which of the following is an efferent neuron that is responsible for releasing a neurotransmitter that stimulates a muscle cell to contract?
a) Motor neuron
b) Sensory neuron
c) Interneuron
d) Neuroglia
Answer:
A. Motor Neuron
Explanation:
Motor neurons which can also be referred to as the lower/alpha motor neurons, furnishes skeletal muscle and causes the muscle to contract, this thereafter generates movement. Motor neurons releases neurotransmitter acetylcholine at the neuromuscular junction that stimulates muscle cells to contract.
At the point when the acetylcholine ties to acetylcholine receptors on the muscle fiber, an activity potential is proliferated along the muscle fiber in the two ways. The activity potential triggers the contraction of the muscle. On the off chance that the end of the muscle are fixed, keeping the muscle at a similar length, at that point the compression results on an expanded power on the backings which is referred to as isometric contraction. On the off chance that the muscle abbreviates against no obstruction, the constriction brings about steady power which is referred to as isotonic contraction. The engine neurons that control appendage and body developments are situated in the front horn of the spinal line, and the engine neurons that control head and facial developments are situated in the engine cores of the brainstem. Despite the fact that the engine framework is made out of various kinds of neurons dispersed all through the CNS, the engine neuron is the main manner by which the engine framework can speak with the muscles.
Ultimately, every movements will rely on the activity of the alpha motor neurons.
Which is the treatment of choice for malaria?
Answer:
Chloroquine phosphate.
Explanation:
Chloroquine is the preferred treatment for any parasite that is sensitive to the drug. But in many parts of the world, the parasites that cause malaria are resistant to chloroquine, and the drug is no longer an effective treatmen
Answer:Chloroquine phosphate.
Chloroquine is the preferred treatment for any parasite that is sensitive to the drug. But in many parts of the world, the parasites that cause malaria are resistant to chloroquine, and the drug is no longer an effective treatment.
A student is measuring the volumes of nectar produced by a flowering plant
for an experiment. He measures nectar from 50 flowers using a graduated
nder that measures to the nearest militer (ml) Which statement
describes a change that could help improve the results of his experiment?
A His measurements will be more accurate if he takes
measurements from an additional 100 flowers
B His measurements will be more precise if he uses a graduated
yinder that measures to the nearest tenth of a ml
His measurements will be more precise if he takes measurements
from an additional 100 flowers
His measurements will be more accurate if he uses a graduated
inder that measures to the nearest tenth of a ml
Answer:
b
Explanation:
A student is measuring the volumes of nectar produced by a flowering plant for an experiment. His measurements will be more precise if he uses a graduated yinder that measures to the nearest tenth of a ml. Thus option B is correct.
what is an experiment ?The experiment is to do test the hypothesis and basic foundation of the scientific method, the different steps include Make observations, form a hypothesis, design experiment, evaluation of result, accept or reject the hypothesis.
variable is an important parameter which are included in an experiment like dependent, independent and controlled variables; An independent variable can not be influenced by other variable factor.
The dependent variable depend on other types of variable where as Control variable is constant variable in an experiment can use to prevent bias of experiment.
For more details regarding experiment, here
brainly.com/question/6074721
#SPJ2
use the samples; diamond, dolomite, gneiss, and chalk and provide your analysis of composition and identification based on their identification characteristics.
Answer:
Diamond-
Physical identification characters:
Color- White or Colorless
Lusture - admantine
Streak - Colorkess
Habit - Hour glass structure
Hardness - 10
Cleavage- octaheadral
Composition- pure carbon
Specific gravity-3.5
Dolomite (CaMg(CO3)2
Color - Colorless or white
Hardness is between 3-4
Reacts with any acid
Gneiss
Light and dark strip or banding present alternatively
biotite , pyroxene have Mafic mineral shows dark banding
Quartz, Feldspar have Felsic mineral for light banding
High grade metmorphic rock which is formed due to regional metamorphism of lower grade rock
Chalk(CaCO3)
Color-White
Very fragile
Hardness-1
With acid gives effervescence.
Analysis of composition and identification based on their identification characteristics are:
1. Diamond
Diamond is harder than a streak plate, colourlessAdamantine, is a nonmetallic mineral.Transparent, translucent, opaque.2. Dolomite (carbonate)
Vitreous, pearly,Transparent to translucent,Perfect, rhombohedral, three directions.3. Chalk (CaCO3)
White,Very fragile,Acid gives effervescence.4. Gneiss
Light and dark strip or banding present alternatively,biotite, pyroxene have Mafic mineral shows dark bandingQuartz, Feldspar have Felsic mineral for light bandingThus, these are the identification characteristics of diamond, dolomite, gneiss, and chalk.
To learn more about the characteristics of carbon compounds click here:
https://brainly.com/question/722824
Only an experiment can prove:
O A. a biological basis.
O B. effectiveness.
O c. causation.
O D. a relationship of any kind.
Answer:
C).causation.
Explanation:
i am guess here but the most that make sense is C
Only an experiment can prove causation. To prove causation you need a random experiment. Thus, option C is correct.
What is experiment?The term experiment has been defined as the process of doing several observations in order to proof the particular topic. The topic which has been given by the teacher or the education institute. The experiment is considered as very important part of the education.
A double-blind experiment is when both parts lack information about the experiment, or the information that they have does not influence the results. Past experiences in the life of both experimenter and people on the experiment, can bias the results. To reduce or eliminate biases in the results, double-blind experiments are developed. Therefore, the people that designed the experiment do not administrate it.
Therefore, Only an experiment can prove causation. To prove causation you need a random experiment. Thus, option C is correct.
Learn more about double-blind experiment on:
https://brainly.com/question/29829648
#SPJ2
Name and describe the levels of organization found in the human body.
Biological anthropologists studied the relationship between stress and female reproduction in a rural community in Guatemala. The researchers collected regular urine samples from women over the course of 1 year. Stress hormone and reproductive hormone levels from the samples were measured to determine a possible relationship between stress and reproductive function. Results suggest that stress may negatively impact reproductive health.
1. What is the primary type of biological anthropology addressed in this research?
2. Does the research also touch on topics that might be relevant to researchers in disciplines outside anthropology, such as biology or psychology? If so, which ones?
Answer:
A. Human behavioral ecology
B. Yes, this research may shed light on the mechanisms involved in human reproduction
Explanation:
Biological anthropology can be defined as a discipline that investigates human behavior in an evolutionary context. This research field is composed of several subdisciplines including, among others, evolutionary biology, forensic anthropology, evolutionary psychology, paleoanthropology, etc. The case above described refers to human behavioral ecology, which is also considered to be a subdiscipline of biological anthropology. This study case may also provide important information about what hormones may affect reproduction in humans, thereby having implications in reproductive medicine
21. Name a structure that is in the medial part of the body, located inferior to the lungs and posterior to the intestines. Note: A coronal section would contain this structure and the heart, and it is more caudal than the pancreas.
Answer:
Kidney
Explanation:
The kidney is in the medial part of the body, located inferior to the lungs and posterior to the intestines.
The kidney is the most important excretory organs of vertebrate, which receives blood from the dorsal aorta through the right and left renal arteries and sends out blood through the right and left renal veins. The transverse section of the kidney shows an outer cortex, beneath which is the Medulla and beneath the Medulla, the hollow pelvis of the kidney.
The cortex and the Medulla consist of thousands of nephrons, which are the kidney's structural and functional units. Each nephron consists of a Bowman's capsule, also called renal corpuscle or malpighian corpuscle, with its network of blood capillaries called glomerulus within it. The remaining part of a nephron is a tubule consisting of three distinct portions, i.e., the proximal convoluted tubule, the U-shaped loop of Henle, and a distal convoluted tubule.
The tubule then leads into the pelvis of the kidney via the collecting tubules. The cortex contains only the renal corpuscle and the convoluted tubules, while the Medulla contains the loop of Henle and the collecting ducts. Ultrafiltration of the blood occurs in the Bowman's capsules, and glucose, amino acids, and large amounts of inorganic ions are reabsorbed at the proximal convoluted end from the glomerular filtrate. The sodium salt is actively transported out of the fluid as it passes through the loop of Henle, and finally, water is reabsorbed from the fluid at the distal convoluted tubule and the collecting ducts.
From here, the filtrate passes through the pelvis into the urinary bladder via the ureter. When the bladder becomes full, the urethral sphincter guarding the outlet relaxes so that urine flows out through the urethra.
Urine contains urea, water, and sodium chloride in addition to other compounds. In the presence of antidiuretic hormone, dilute urine is produced. Kidney stones are solid particles formed in the kidneys, which can block kidney tubules.
A long-term goal(s) of the bioinformatic analysis of a pathogenic bacterium is _________. Group of answer choices
A long-term goal(s) of the bioinformatic analysis of a pathogenic bacterium is the identification of molecules that could be used as targets by antimicrobial agents, or develop or improve a vaccine.
What is the best way to avoid E. Coli
Washing your hands. Avoid cross contamination.
Explanation:
why must food be digested
Answer:
Digestion is important for breaking down food into nutrients, which the body uses for energy, growth, and cell repair. Food and drink must be changed into smaller molecules of nutrients before the blood absorbs them and carries them to cells throughout the body.
Hoped I helped
What part of the cell divides first?
Answer:
yes
because cell divides a small in world
Functions of the organ systems of the body.
Classify each of the following physiological functions with the correct body system.
A. Receives sensory input
B. Helps regulate metabolism
C. Produces hormones
D. Produces gametes
E. Maintains posture
F. Differs in males and females
G. Supports the body
H. Initiates motor output
I. Produces heat
J. Produces blood cells
1. Skeletal System
2. Muscular System
3. Nervous System
4. Endocrine System
5. Reproductive System Reset
Answer:
Helps regulate metabolism- Endocrine System.
The production of certain hormones regulate the process of digestion.Gastrin,secretin and cholecytokinin are the hormones of the alimentary canal which regulate digestion. In addition,testosterone,oestrogen,progesterone,and sugar regulatory hormone -insulin are other hormones involved in metabolism.
Produces hormones-Endocrine System
This contains certain gland which secretes hormones directly into the blood stream,to be carried to the target part of the body.The endocrine glands are located in different part of the body;The hormones secreted are proteins or cortisol.
Supports the body-Skeletal System
This is the system which contains bones and cartilages for the attachment of ,muscles for locomotion and stability.it form the framework of the body.Therefore the interaction of the muscles and bones is refers to as the skeletal muscular system.The bones can not provide support without the presence of muscles.
Produces heat-Muscular System- this stems from shivering.it refers to spasmodic contraction of the muscles due to drop in body temperature to generate heat.it is an auto-regulatory mechanism to rise the body temperature when this drops below baseline.
Differs in males and females-Reproductive System
This is designed the male organ as an intromittent organ(Penis) with two testis for sperm production,and the opening as(Virginia) in female
Maintains posture - Muscular System.
it is the contraction and relaxation of the muscles which ensures posture.The musculo-skeletal systems which ensures posture,stability in animals ensures the bones and muscles are aligned.
Produces gametes-Reproductive System-Ovaries in females and testis in males are the sites of ova and sperms respectively as the gametes
Receives sensory input- Nervous System- the PNS send sensory inputs to the CNS for coordination of the Nervous system.These inputs are sent from the receptors.
Produces blood cells-Endocrine System
This is exemplified with the thymus which helps in the production of white blood cells,from its location in the neck
Explanation:
Identify the statement that correctly describes the change in body size between Homo habilis and Homo erectus.
Humans autosomal cells have two copies each of 23 unique chromosomes. Match each cell division event and cell type according to the number of chromatids present.
a. primary oocyte arrested prior to ovulation
b. spermatozoa
c. oogonium prior to S phase
d. secondary polar body
1. 23 Chromatids
2. 44 Chromatids
3. 92 Chromatids
Answer:
a. primary oocyte arrested prior to ovulation >> 44 Chromatids
b. spermatozoa >> 23 Chromatids
c. oogonium prior to S phase >> 92 Chromatids
d. secondary polar body >> 23 Chromatids
Explanation:
An immature ovum can be defined as a cell that after oogenesis produces an ovum. The development of an immature ovum involves the following stages: oogonium (46 chromosomes, 2 chromatids), prymary oocyte (46 chromosomes, 4 chromatids), secondary oocyte (23 chromosomes, 2 chromatids), ootid (23 chromosomes, 1 chromatid) and mature ovum (23 chromosomes, 1 chromatid).
The secondary oocyte after the second meiotic division produces a mature ova and a secondary polar body (haploid, 23 chromosomes, 1 chromatid), which generally is not fertilized.
The spermatozoa are male haploid gametes (23 chromosomes, 1 chromatid) developed from germ cells.
In 3.a (above) you mutated one letter. What role do you think the redundancy of the genetic code plays in this type of change?
Answer:
It has a role of mutation and eventual evolution in the field of genetics.
Explanation:
The changing of one letter represents whether or not the amino acid encoded by the triplet base will be affected. Redundancy in code means there are multiple codes that will be translated to the same amino acid, so a change/mutation in that position does not alter the protein produced.
In an experimental study, the independent variable is
Which independent variable affected the organism’s health positively in each of the trials? Why do you think this occurred?
Answer:
Please see below
Explanation:
The variable that had the most affect was the salinity. The sea animals have a tough time trying to survive under highly saline sea water, as this upsets their internal environment as well, in turn affecting their bodily functions and overall health too. The reason behind this was probably that they were used to an environment of high levels of salinity and low levels of light.
What is the main purpose of a scientific investigation
A. to form an opinion
B. to test a hypothesis
C.to persuade with bias
D. To teach a lesson
Answer:
To test a hypothesis
Explanation:
I took the test and got it correct.
Hope this helpped! ;)
Make one or more observations. Create a hypothesis that serves as a rough summary of what has been observed, and then build your forecasts on it. Test the theory and the predictions in a repeatable experiment. Thus, option B is correct.
What is main importance of scientific investigation?The two main objectives of scientific investigation are knowledge production and hypothesis development. Various people and settings are employed to conduct scientific research.
There are numerous methods for conducting scientific research, all of which rely on the collection of various types of data.
A plan for raising questions and putting potential solutions to the test is a scientific research. Observations are frequently the first step in a scientific research.
Observations are typically followed by questions. A hypothesis is a possible response to a scientific query based on the state of science today.
Therefore, to test a hypothesis is the main purpose of a scientific investigation.
Learn more about scientific investigation here:
https://brainly.com/question/12878152
#SPJ2
The mechanism that accounts for high frequencies of sickle cell hemoglobin in malarial environments is:
Answer:
Selection -Selective advantage
Explanation:
Sickle cell hemoglobin result from the sickle shape of red blood cell instead of the ameboid shaped cell.
Malaria is a deadly disease that result from mosquito bites.
Sickle cell hemoglobin has a selective advantage because of the presence of AS genotype, the s allele in a sickle cell is an harmful recessive allele that remains in the gene pool it becomes expressed when the s allele is expressed in SS form after an AS individual have mated with either an AS or SS individual.
AS genotype has a high resistance against malaria, they have the ability to thrive making the allele s that is recessive for sickle cell thrive well in the environment of malaria in an AS individual.
A(n) __ bond joins these two oxygen atoms.
quadruple covalent
ionic
hydrogen
single covalent
double covalent
i think its ionic bond not sure but ionic means, deffinition: Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds. It is one of the main types of bonding along with covalent bonding and metallic bonding. Ions are atoms with an electrostatic charge.
A double covalent bond joins two oxygen atoms. So the correct option is E.
What is a covalent bond?
When two atoms share an electron pair, it forms an interatomic connection known as a covalent bond in chemistry. The electrical attraction of their nuclei for the identical electrons is what causes the binding. When the linked atoms' combined energies are lower than those of widely spaced atoms, a covalent connection is created.
The inorganic elements hydrogen, nitrogen, chlorine, water, and ammonia (H2, N2, Cl2, H2O, NH3) as well as all organic compounds are examples of molecules with covalent connections. Covalent bonds are denoted as solid lines joining atom pairs in structural representations of molecules.
A single line denotes a bond between two atoms (i.e., one electron pair), a double line (=) denotes a double bond between two atoms (i.e., two electron pairs), and a triple line () denotes a triple bond, such as that found, for instance, in carbon monoxide (CO).
Therefore the correct option is E.
Read more about covalent bonds, here
https://brainly.com/question/19382448
#SPJ2
Does fertilizer make a plant grow bigger?
Answer:
yes and no
Explanation:
It depends on the plant and what you want to do to it.
Example some fertillzer can make the plant grow bigger and some make it produce stuff like tomatoes.
Anyone get these type of questions
Answer:
I can't see the graph
Explanation:
I can't see the graph
post it in the comments
I will give you the ans
abilit of the kidneys to remove molecules from the blood plasma by excreting them in the urine is known as
Answer:
This question lacks options, options are:
A. glomerular filtration.
B. renal clearance.
C. micturition
D. reabsorption
The correct answer is B.
Explanation:
The kidneys remove waste and excess water from the blood (such as urine) and help keep chemicals (such as sodium, potassium, and calcium) in the body balanced. Renal clearance is defined as the volume of blood plasma (ml), which due to the effect of renal function, is free of substance X in the unit of time (in minutes). Substance X becomes part of the urine, that is, renal clearance is the amount of blood that is free of a substance as it passes through the kidney in a unit of time.
According to the cell theory, which describes cells? All organisms are composed of multiple cells. All cells have the same structure and function. Cells are found in everything on Earth. All living cells come from other living cells.
Answer:
it is not b. but i think its d. not sure if its right.
Explanation:
i chose b. and got it wrong.
The first option is correct All organisms are composed of multiple cells.
The following information should be considered;
The cell theory states that all living things should be composed of one or more cells. The cell is the basic unit of life and new cells could be produced from existing cells.learn more: https://brainly.com/question/20492533?referrer=searchResults
computer modeling gives scientists the ability to study the interaction of complicated systems without actually conducting an experiment. True or false?
Answer:
true
Explanation:
Dumping of organic wastes into a lake may result in anaerobic conditions in the lake because
Select one:
a. some microorganisms use the organic matter to respire aerobically, reducing the oxygen content of
the water
b. organic matter absorbs the oxygen from the water
O c. the space occupied by the organic matter reduces the volume that could be occupied by the
oxygen
d. organic matter results in waste heat
Answer:
A.
Explanation:
Just took the test, and I was told A.
Dumping of organic wastes into a lake may result in anaerobic conditions in the lake because some microorganisms use the organic matter to respire aerobically, reducing the oxygen content of the water.
What do you mean by organic wastes?"Organic waste is any material that is biodegradable and comes from either a plant or an animal."What do you mean by anaerobic conditions?It is a condition when the oxygen level decreases or disappear.Aerobic respiration- It is the process of respiration that takes place in the presence of oxygen gas to produce energy from food.When organic wastes are dumped into lake, the microorganism starts decomposing it by utilizing the oxygen present in water. The disappearance of oxygen is faster than its production by photosynthesis. So, the lake will now have an anaerobic condition.
Hence, the correct option is a. some microorganisms use the organic matter to respire aerobically, reducing the oxygen content of the water."
To know more about anaerobic condition here
https://brainly.com/question/6086790
#SPJ2
what structural differences makes adenine and guanine different from cytosine, thymine, and uracil? (figure 2-24)
Answer:
Nitrogenous bases have two distinct families known as purines and pyrimidine, nitrogenous are the building blocks or monomer units of the nucleic acids.
The major and significant difference between purines and pyrimidines is the difference in their structures-
The purines are divided into two different bases called adenine and guanine and each of them have a two-ringed structure formed with a 9-membered molecule and 4 nitrogen atoms which makes it a large in size than purines.
The pyrimidines are divided into 3 bases that are cytosine, uracil, and thymine and all these have only one single ring of six members and 2 nitrogen atoms. These are smaller in size.