Answer:
Protista
Explanation:
Protista is the first class of multicellular organism that arose in history. The first of this member is cyanobacteria.
Cyanobacteria is large group of photosynthetic organism that produce their own food by using light energy from sun and carbondioxide.
The first evidence of multicellularity is from cyanobacteria-like organisms that lived 3–3.5 billion years ago.
They help to can convert inert atmospheric nitrogen into an organic form, such as nitrate or ammonia.
The multicellular clade that appeared first in the history of life on Earth is ANIMALIA.
The Kingdom Animalia (also known as Metazoa) is a clade that consists of multicellular-heterotrophic organisms, which cannot synthesize their own food.
It has been estimated that the first animals evolved around 800 million years ago.
The first animals that appeared on the Earth were sponges or sponge-like animals.
In conclusion, the multicellular clade that appeared first in the history of life on Earth is ANIMALIA.
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What physical traits were favored in the peppered moth AFTER the Industrial Revolution?
Answer: Their skin color was dark which made the moths blend in. During the Industrial Revolution, the soot from factories caused the trees to become black. The light colored moths became easier to kill because they could not blend into their environment.
Explanation:
The currently accepted model of the cell membrane was discovered by ________ in the year ______
A) Charles Overton, 1895
B) singer and Nicolson, 1972
C) Davison and Danielli, 1970
D) Irving Langmuir, 1917
Answer: B
Explanation: The currently accepted model of the membrane is the fluid mosaic model. S. J. Singer and G. Nicolson proposed the fluid mosaic model in 1972.
The cell membrane model depicts the arrangement of the biological membrane and its component. The fluid mosaic model was given by Singer and Nicolson in 1972. Thus, option B is correct.
What is the fluid mosaic model?
The fluid mosaic model was discovered by Singer and Nicolson and is a widely accepted model for the structural organization of the plasma membrane and its components. It elucidates the mosaic of plasma components.
The proteins, lipids, and carbohydrates are the main components of the plasma membrane that are arranged and shows the fluid nature of the biological membrane.
Its arrangement and structure allow the semi-permeable nature and its role as the barrier. It shows the membrane is a lipid bilayer that includes the hydrophobic tail and the hydrophilic head.
Therefore, the fluid mosaic model was given by Singer and Nicolson.
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Before using any chemical in the lab, why should one first read the Material Safety Data Sheet (MSDS)?
The MSDS provides information on safe handling of the chemical.
The MSDS explains where the chemical can be purchased.
The MSDS provides the chemical formula for the substance.
The MSDS describes how the chemical will react with other substances.
Answer:
A
Explanation:
Took test on Edge.
Material Safety Data Sheet (MSDS) contains information related to occupational safety and health. The MSDS provides knowledge on the safe handling of chemicals. Thus, option A is correct.
What is MSDS?Material Safety Data Sheet (MSDS) is the data safety sheet that states the rules and details of handling and using the laboratory chemicals that are related to health. It is of great importance as it allows the learning of chemical hazards.
Before entering the lab and using the chemicals one should read the MSDS book so to get aware of the handling and precautions that have to be taken while performing any experiments. To work safely one should know its danger and should be prepared for emergencies.
Therefore, the MSDS provides knowledge on the handling of hazardous chemicals.
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When the body cells are hypotonic to the blood plasma, water will move from intracellular fluid to extracellular fluid.
A. True
B. False
Answer:
True
Explanation:
Gene X always produces the same mRNA (one splice form) and the same protein in all cells in which it is expressed. The same amounts of gene X mRNA and protein are present in brain, kidney, and heart cells. However, the activity associated with the protein is present only in the heart. Which of the following are possible explanations?
a. A splicing factor necessary for removing all of the primary transcript's introns is present only in the heart.
b. A splicing factor necessary for removing all of the primary transcript's introns is present only in the brain and kidney.
c. Protein X is phosphorylated only in the heart.
d. Protein X is phosphorylated only in the brain and kidney.
There are two explanations for this phenomenon: phosphorylation of the protein X in the heart activates its function (Option C) or phosphorylation of the protein X in the kidney and the brain deactivates its function (Option D). Therefore, both Option C and Option D are correct.
Phosphorylation is a posttranslational protein modification that is capable of activating or deactivating protein function.
Phosphorylation alters the three-dimensional structure of a protein, thereby modifying its function (i.e., activate or deactivate the target protein).
Phosphorylation occurs at specific amino acids (e.g., serine and threonine residues) of the target protein.
Moreover, mRNA splicing (RNA processing) occurs before the protein state, it is a transcriptional process. This process consists in removing the non-coding regions or 'introns' from pre-mRNA and subsequent joining protein-coding regions or 'exons' to enable the translation of the mRNA into a protein.
In consequence, in this case, it is possible that 1-phosphorylation of the protein X in the heart activates its function, or 2-phosphorylation of the protein X in the kidney and the brain deactivates its function. Therefore, both Option C and Option D are correct.
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The vector allows for protein expression in E. coli.
Briefly explain the role of the following elements in the context of gene expression and protein production:
1- LacP:
2- LacO:
3- LacZa:
4-Briefly explain and indicate what is required for high expression in E. coli in this context..
The vector also contains other important elements. Explain their role:
5- AmpR:
6- ori:
Answer:
1. Lac P or the promoter is the binding site for RNA polymerase, situated just upstream to the gene.
2. Lac O or operator is a sequence situated just downstream to the sequence of the promoter at which binding of the repressor protein is done and ceases RNA polymerase enzyme from binding.
3. Lac Z refers to the gene that encodes for protein beta-galactosidase, which further results in the formation of glucose and galactose from lactose.
4. For high expression in E.coli IPTG is required. It attaches with the lac repressor and discharges the tetrameric repressor from the lac operator in an allosteric fashion, thus, permitting gene transcription in the lac operon.
5. AmpR is also known as the ampicillin-resistant gene, which is utilized as a selective marker for selection against ampicillin antibiotic.
6. Ori or the origin of replication refers to the sequence of the genome, which is accountable for the initiation of replication.
Anyone know this??? Help!!!
Devise an experiment to test the effect of pH on the activity of biological washing powder
Answer:
I think you are nepali yeah but I don't have your question ❓ answer
In ______, Gorter and Grendel extract lipids from blood cells. After evaluating them, they propose membranes are made of a ____________.
Answer:
The correct answer would be - 1925, phospholipid bilayer.
Explanation:
Gorter and Grendel performed an experiment in 1925 to extract lipids from blood cell and after extracting the protein they evaluated red blood cell membrane.
They found out that plasma membrane have two lipid layer and these lipids are made of phospholipids. Phospholipids are phosphate group that are attached with the lipid molecule.
Thus, the correct answer would be - 1925, phospholipid bilayer.
reptilesimprovements over amphibians
_is a molecule that directs all of a cells activities
Answer:
[tex]\boxed{\mathrm{Nucleus}}[/tex]
Explanation:
The nucleus directs all cellular activities. The nucleus also contains genetic material of eukaryotic organisms.
Lactose (milk sugar) is a carbohydrate that is formed by combining galactose and glucose. Which term best describes this molecule?
Answer:
disaccharide
Explanation:
A disaccharide is a form of sugar that is made up of the combination of two other sugar molecules that are simple. They possess the property to dissolve easily in water. The process that occurs to join the two simple sugars includes the removal of water from the molecules. Sucrose, lactose, and maltose are the three disaccharides.
Answer:
disaccharide
Explanation:
A disaccharide is a form of sugar that is made up of the combination of two other sugar molecules that are simple. They possess the property to dissolve easily in water. The process that occurs to join the two simple sugars includes the removal of water from the molecules. Sucrose, lactose, and maltose are the three disaccharides.
Which of the following pairs of organisms
would have the MOST SIMILAR niche in
their environments.
Zebra and Lion
Squirrel and Chipmunk
Robin and Bald Eagle
Oak Tree and Mushroom
Answer:
Squirrel and Chipmunk
Answer:
C. a lion hunting for a zebra in the grassland
Explanation:
E2023
what is sexual reproduction
Answer:
See explanation below...
Explanation:
Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes combines with another to produce an organism composed of cells with two sets of chromosomes.
Best Regards!
Answer:
the production of new living organisms by combining genetic information from two individuals of different types (sexes). In most higher organisms, one sex (male) produces a small motile gamete which travels to fuse with a larger stationary gamete produced by the other (female).
Which statement best describes geothermal energy? Geothermal energy can be used to fuel vehicles. Geothermal energy increases the risk of a nuclear accident. Geothermal energy is the most abundant nonrenewable resource. Geothermal energy can be used as a source of electricity.
Answer:
Geothermal energy
Explanation:
can be used as a source of electricity. hope this helps you :)
Answer:
D
Explanation:
Tell me three things that you know about controlling microbial growth - think about how you handle certain foods in you home. Why is it so important to learn about how we can control microbes
1. Cooking food properly. Undercooked foods may still contain microorganisms that are harmful.
2. washing raw foods properly. It can remove thermophilic microorganisms which can't be inhibited by temperature.
3. Hands should be clean. Handling affects the most.
Its important to learn about controlling microbes because
microbes are everywhere and many are really harmful for other living beings. so,
•To be safe from life-threatning diseases.
what is the feature of the eye and it's parts
Answer:
1. Cornea
2. Pupil
3. Iris
4. Conjunctiva Glands
5. Lacrimal Glands
Answer:
The cornea, a clear window at the front of the eye, covers the iris and the pupil. A clear lens, located behind the pupil, acts like a camera lens by focusing light onto the retina at the back of the eye. The retina is a light-sensitive inner lining at the back of the eye.
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Which medical conditions are associated with large amounts of fat and sugar in your diet? Select three options.
Answer:
gall bladder disease
hypertension
osteoarthritis
Answer:
diabetes
heart disease
obesity
Explanation:
three (3) advantages of using a resource person in handling the First Aid lesson.
Answer:
Advantages of resource person in handling the first aid lesson are as follows:
He is an expert who share important points during first aid and prevents any mishappening.They also provide assistance to the community member and provide social audits in villages.A resource person can share extreme difficult cases of injuries and will introduce new methods to adopt first aid in those conditions.The original name for Asian Homo erectus was Group of answer choices Homo rudolfensis. Australopithecus. Paranthropus. Pithecanthropus.
Answer: Pithecanthropus erectus.
Explanation:
Between 1891 and 1892 Eugène Dubois believed he had found the "missing link", hypothesized by Ernst Haeckel, when he discovered some loose teeth, a skull cap and a femur - very similar to that of modern man - in the excavations he was carrying out in Trinil, located on the island of Java, Indonesia. Homo erectus erectus was the first specimen of Homo erectus to be discovered. Dubois first named it Anthropopithecus erectus and then renamed it Pithecanthropus erectus. The name Homo erectus means in Latin "erect man", wich means, "standing man", whereas Pithecantropus erectus means "standing ape-man".
So, Dubois published these findings as Pithecanthropus erectus in 1894, more popularly known as "Java Man" or "Trinil Man". In the 1930s the German palaeontologist Ralpf von Koenigswald obtained new fossils, both from Trinil and from new locations such as Sangiran and in 1938 von Koenigswald identified a magnificent Sangiran skull as "Pithecanthropus". It was not until 1940 that Mayr attributed all these remains to the genus Homo (Homo erectus erectus).
2x - 5 = 7
slove for x
2x-5=7
2x=7+5
2x=12
x=12/2
x=6
_______
General and Specific knowledge example
PLEASE ITS URGENT!
Can someone help me name them!
Answer:
i filled the thing out for you. i didnt know what grade you were in so i just put the cell names in.
Explanation:
If you insert a gene from bacteria into a mouse genome, then which terms best explains what you just made?
Answer:
a transgenic animal
Explanation:
The dark bands seen under the microscope in a skeletal muscle fiber are concentrations of actin protein called l-bands . It is true or false.
Answer:
it is false
Explanation:
it appears as light bands under microscope
Answer:
false
Explanation:
because dark band seen under the microscope in a skeletal muscle fiber are concentration of actin protein are known as A bands because they are anisotropic when viewed with polarized light
Wall lizards are not seen during cold, Why?
Wall lizard are not seen because blood becomes cold inside the body.
Answer:
Lizards are cold-blooded. They use their enviornment to control their body temperature. If a lizard is cold, it will go somewhere warmer. If a lizard is hot, it will go someone to cool off.
The lizard may find somewhere in direct sunlight, bury themselves in a hole, or bury themselves under leaves to keep warm.
Describe your plan to preserve the biodiversity of the town's lake. Make sure to include the materials that you would need for your plan to work and how you would scale it up to test it.
Answer:
10 Ways to Protect and Conserve Biodiversity
Government legislation.
Nature preserves.
Reducing invasive species.
Habitat restoration.
Captive breeding and seed banks.
Research.
Reduce climate change.
Purchase sustainable products.
Which is incorrect descriptions of the genetic event initiated by the HIV reverse transcriptase (RT) upon the HIV infection?
a. RT catalyzes initial synthesis of ssDNA using viral genomic RNA as the template.
b. The first RNA template is degraded after ssDNA synthesis.
c. The whole process is completed after synthesis of dsDNA.
d. tRNAs are adopted as the first primers.
e. None of these
Answer:
e. None of these
Explanation:
The immune deficiency viruses (HIV) are retroviruses that use a reverse transcriptase (RT) enzyme to produce a single-stranded DNA (ssDNA) from an RNA template. The reverse transcription allows retroviruses to replicate their genetic material, which is integrated into the host's genome as a double-stranded linear DNA molecule in a similar way to the mechanism of insertion used by endogenous retrotransposons. The synthesis of DNA is started by cellular tRNAs (tRNA3Lys) that are packaged into the virion. After reverse transcription, the HIV DNA enters the nucleus of CD4 immune cells (also known as CD4+ T cells), and then it integrates into the genome to coopt the host's cell machinery for its own replication.
Which of the following is true about the speed of light?
O it is a constant when the light is traveling in a vacuum.
O It speeds up or slows down depending on the observer.
O It is slowest in a vacuum.
O lt varies depending on the color of the light.
Answer:
It is a constant when the light is traveling in a vacuum.
Explanation:
When neuroscientists employ the term "nucleus", they are usually referring to:_____.
a. a cluster of glial cells in the dorsal-medial CNS.
b. a neural unit composed of anatomically and functionally related neurons.
c. a group of homologous ganglia located either in the cortex or in the cerebellum.
d. cognitively synchronized clusters of apical dendrites anywhere in the PNS.
Answer:
B. A neural unit composed of anatomically and functionally related neurons.
Plaque formation in virus is done for :
a) Isolation and typing of virus
b) Cloning seperation of specific of virus
c) Determining infectivity of virus
d) Accessing multiplication of virus
Answer:
I think the answer is determining infectivity of a virus
Explanation:
hope that it will help you