Answer: What does the endosymbiont hypothesis propose? It proposes that early eukaryotic cells acquired the precursors of mitochondria and chloroplasts by engulfing certain types of bacteria. ... Mitochondria, chloroplasts, and centrioles in eukaryotic cells each contain their own minute and unique supply of DNA.
Explanation:
The first piece of evidence that needed to be found to support the endosymbiotic hypothesis was whether or not mitochondria and chloroplasts have their own DNA and if this DNA is similar to bacterial DNA. This was later proven to be true for DNA, RNA, ribosomes, chlorophyll (for chloroplasts), and protein synthesis.
The water vascular system of echinoderms _____. The water vascular system of echinoderms _____. is analogous to the gastrovascular cavity of flatworms moves water through the animal's body during suspension feeding functions in locomotion and feeding functions as a circulatory system that distributes nutrients to body cells is bilateral in organization, even though the adult animal is not bilaterally symmetrical
Answer:
The water vascular system of echinoderms functions in locomotion and feeding.
Explanation:
Echinoderms have a unique vascular aquatic system called the ambulacral system.
The ambulacral system refers to a net of fluid-filled channels derived from the coelom with functions related to gas exchange, feeding, stimuli reception, and locomotion. This system acts as a hydro motor apparatus.
The opening to the exterior of this vascular system is through an opening known as madreporite. This structure is united to the circular channel that surrounds the animal´s mouth and from where five radial channels emerge and extend along each arm. Water runs through these structures and makes it possible the gas exchange, feeding, locomotion, and other functions. By hydrostatic pressure, little tubular feet are protruded and retracted and help the animal to move.
After you form a hypothesis
you must test to see if it is correct.
Answer:
true
Explanation:
Hypothesis testing is used to assess the plausibility of a hypothesis by using sample data. The test provides evidence concerning the plausibility of the hypothesis, given the data. Statistical analysts test a hypothesis by measuring and examining a random sample of the population being analyzed.
A student is using a microscope to observe samples taken from pond water. She notices something that she thinks may be a living thing. Which feature would BEST support that the unknown sample is a living thing?
Answer:
If the thing was moving- and it was manipulating the matter around it
Explanation:
Living things are characterized as living/not living through a couple of characteristics:
is it feeding itself? living things feed themselves from things in their surrounding enviroment.
is it growing? living things always grow/change. a rock doesn't grow and change.
does it reproduce? living things need to reproduce.
is it respirating?
is it moving?
When a chance mutation modifies a virus to attach to a new host species, it is called
Answer:
gain-of-function
Explanation:
Gain-of-function mutations represent a type of genetic change that may confer a new function to the gene that undergoes the mutation. In this case, a gain-of-function mutation conferred to the virus an adaptive advantage by allowing it to encode a new protein which is capable of attaching to the cell membrane of a new host. In this regard, it is important to note that loss-of-function mutations are quite common in nature, while gain-of-function mutations are relatively rare.
12. An example of a hydrogen bond is the bond between?
The Hydrogen of one water molecule and the Oxygen of another water molecule.
The two hydrogen atoms in a molecule of hydrogen gas (H2).
Carbon and Hydrogen in a molecule of methane (CH4)
Sodium (Na) and Clorine (CI) in salt.
Answer:
The hydrogen of one water molecule and the oxygen of another water molecule
The Hydrogen of one water molecule and the Oxygen of another water molecule.
Hydrogen bonding happens when a hydrogen atom from one molecule attracts an electronegative atom like oxygen or nitrogen in another. Water is cohesive and sticky because the hydrogen atom in one water molecule bonds with the oxygen atom in another.
Hydrogen bonding affects the structures and characteristics of molecules and compounds in nature and is important in many biological and chemical processes. Therefore, the Hydrogen of one water molecule and the Oxygen of another water molecule.
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A sample of an unknown liquid has a volume of 24.0 mL and a mass of 6 g. What is its density?
Answer:
0.25 g/cm³ or 0.25 g/mL
Explanation:
Density = Mass / Volume, so you would then plug in your two variables.
D = 6 g/ 24 mL = 0.25 g/mL or 0.25 g/cm³
Answer:
15.607 lbs or 250 g/L
Explanation:
Density is calculated by dividing the mass (6 g.) by the volume (24 mL). With that knowledge you come to the answer which is 250 g/L which is the measurement I'm assuming you'd need considering you're dealing with a liquid.
If you need a different measurement of density, let me know.
________________ are substances that break lipids (fats) into very small globules so that they are more manageable in watery fluids
Answer:
Emulsifier
Explanation:
Emulsifier are the chemical additives which are required to breaking up fats or lipids globules into much smaller emulsion droplets.
An emulsifier consist of one oil-friendly and one water-friendly end. When an emulsifier added with fat or lipid, the emulsifier face towards the oil/water or air/water interface reduces the surface tension to make emulsion more stable.
Emulsification of fat makes the food easy to absorbed by small intestine.
Hence, the correct answer is "Emulsifier ".
Which of the following is not a way in which antihistamines may affect transduction pathways? (1 point) They prevent enzymes from transforming histidine into histamine. They prevent release of histamine by blocking signal transduction. They reduce cellular response by blocking signal transduction. They reduce histamine in the blood by binding to and destroying it.
Answer:
The correct answer is : They reduce histamine in the blood by binding to and destroying it.
Explanation:
Antihistamines are type of drugs that inhibits release of histamine by binding to histamine receptors and suppress the transduction pathways of histamine.
They blocks the enzymes from transforming histidine into histamine and reduce cell response by blocking histamine-induced cascade signal transduction. These are use to treat allergies, congestion, hay fever and other allergy responses.
Thus, the correct answer is : They reduce histamine in the blood by binding to and destroying it.
Skiing was first held in 1924 at chamonix in -
A)France
B)USA
C)UK
D)Canada
Answer:
the ewser is A
Explanation:
Originally held in association with the 1924 Summer Olympics, the sports competitions were held at the foot of Mont Blanc in Chamonix, and Haute-Savoie, France between January 25 and February 5, 1924....
Does anyone have the answer for this?
Answer:
chalcopyrite
Explanation:
Can someone please help me with 6-16 please! Thank you! :)
Answer:
6. testable
7. non testable ( it is an opinion )
8. testable
9. testable
10. testable
11. non testable
12. testable
13. testable
14.non testable
15. testable
16. testable
Explanation:
ask yourself wether or not these questions could be answered as a lab it'll help you determine if they are testable or not.
Identify ways in which all biological systems from cells and organisms to populations, communities and ecosystems are affected by complex biotic and abiotic interactions involving exchange of matter and free energy
Answer:
Explanation:
Cell which is the basic unit of life is affected by the interactions with biotic and abiotic factors such as temperature, sunlight. Organisms are made up of cells and they respond differently to temperature changes, sunlight, water availability. Some cell perform better at some certain range of temperature while some cannot.
Organism itself are affected by the interaction of some of this factors this include water and nutrients availability. Distribution of organism in a particular habitat is greatly influenced by availability of water and nutrients it lead to competition for survival among organism. Population density and species diversity also influence community and ecosystem. Population determines how resources is allocated in a community and it affect the activities of the organism in that domain or territory.
Each of the following is true about Ras except:______
a. Ras activates a cascade of phosphorylation events within the cell.
b. Ras is monomeric. Ras is activated by Sos, a guanine nucleotide exchange factor.
c. Ras activity is inhibited by GTPase activating proteins (GAPs).
d. Ras binds steroid hormones.
Answer:
c) Ras Binds steroid hormones
Explanation:
Ras which belongs to a protein family, which are used in the transmission of the signal within the animal cell. It should be noted that The protein in Ras is associated to Gpase.
The characteristics of Ras are:
✓ Ras is activated by Sos, a guanine nucleotide exchange factor
✓Ras activates a cascade of phosphorylation events within the cell
✓ Ras is monomeric
✓ Ras activity is inhibited by GTPase activating proteins.
Therefore, all the options are true about Ras except C.
Convert 325 mililiters to liters
1l = 1000ml
325ml : 1000 = 0.325liters
Answer:
.325 liters
Explanation:
The answer is .325 liters cause am smart and i am in bio! :)
Any planet with a solid surface, such as Earth or Mars are rocky planets.
True
False
Answer:
True
Hope it helps......
Question 1
Which statement is true about the force of gravity
Para a ocorrência de osmose, é necessário que (analise as afirmações a seguir e marque como resposta a soma dos itens corretos usando os números entre parênteses):
(04) as concentrações de soluto dentro e fora da célula sejam iguais
(08) as concentrações de soluto dentro e fora da célula sejam diferentes
(16) haja energia na célula para que o transporte de água ocorra
(32) haja lipídios atravessando a barreira
(64) haja parede celular para o rompimento da célula
Answer:
(08) and (32)
Explanation:
To make osmosis happen there has to be a difference in the concentration of solutes, between the inside and the outside of the cell. To valance this difference in concentration, water has to flow towards a place that has a higher number of solutes.
The lipids in the cell's wall make this membrane semipermeable. This allows the passage of specific components only, such as water through aquaporins. Lipids and other elements are of importance in the barrier because they maintain the cell separated from the outside, allowing it to be balanced as regards the different substances that can interact with it.
Please help
Explain Give two examples of how abiotic factors are influenced by biotic factors?
Answer: If this doesn't help just let me know
The abiotic factors will define which organisms are able or not to live in a specified place. The living organisms will constitute the biotic factors, which define if and how can an organism live in a specified environment. So, the abiotic factors are controlling the biotic factors of an environment.
The interaction between humans and water and plants and soil are examples of the influence of biotic factors on abiotic ones.
Biotic and abiotic factors are biological terms to refer to:
Abiotic factors: are the set of non-living physical and chemical components of an ecosystem.Biotic factors: are the set of living components of an ecosystem.According to the above, living beings (biotic factors) can affect abiotic factors such as water because they contaminate it with chemicals or waste.
Also, plants (biotic factors) see the soil (abiotic factors) because they provide them with nutrients.
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14. Would eating a whole pizza be a good source of energy and still be healthy?
your answer.
I don’t know what to write help me
Answer:
it'll buff
Explanation:
it is what it is
Answer:
It depends what's on the pizza, and how hungry you are. Humans need a balanced diet. A pizza would be a good source of energy, especially if it had some protein and vegetables on it. Since the crust is a starch, you would need to drink a lot of fluids. Yes, eating a whole pizza can be a good source of energy and still be healthy.
Hope this helps
I really need help! A. Descriptive Data Analysis B. Inferential Data Analysis
Is a descriptive analysis
Answer: Your wish is my command. The answer you are looking for is B. Inferential Data Analysis. :)
Explanation:
Fossil fuel combustion from millions of cars contributes to air pollution and climate change. Given this information, which is the best example of sustainability in transportation?
Answer: Bike Riding
Explanation: bikes have no gas and help the enviroment. Even Eletri cars can help!
As water is cooled, its density
until it reaches about 4° C.
A. decreases
B. increases
C. decreases and increases
D. stays the same
As water is cooled its density increases 4 degrees Celsius is reached
Cooling causes water to slow down at a faster rate occupying a smaller rate as hot water is less dense than the room temperature as cold water is denser and will freeze at room temperature.
Water being a solvent has various physical and chemical properties.
Water has to condense to a certain point to produce the desired effects.
So B) Increases
A hydrophobic organic compound composed mainly of carbon and a high ratio of hydrogen to oxygen is a ______. Examples include fatty acids, fats, phospholipids, steroids, and prostaglandins.
Answer:
Lipid
Explanation:
Lipid is known as a hydrophobic organic compound composed mainly of carbon and a high ratio of hydrogen to oxygen.
They usually form a large macromolecule and known to be insoluble in water and soluble in substances such as alcohol, ether which makes it non polar substances.
They are however very important and are major constituents of plants and animal cells
Why don't prokaryotic cells divide through mitosis? Mitosis requires a cell membrane, and prokaryotes don't have a cell membrane. Mitosis and cytokinesis require cytoplasm, and prokaryotes don't have cytoplasm. Mitosis is division of the nucleus, and prokaryotes don't have a nucleus. Mitosis requires DNA and chromosomes, and prokaryotes don't have chromosomes.
Answer:
Prokaryotic cells, on the other hand, do not undergo mitosis and therefore have no need for a mitotic spindle.
Explanation:
Which of the following organisms breaks down dead material and returns the substances to the environment?
Answer:
C.Bacteria
Explanation:
The organism that breaks down dead materials are decomposers, ofc lion and vulture arent decomposers. Algae also a producer and not a decomposer. So the only answer is bacteria, bacteria is a small organism that eat and decompose dead things :)
The organism that breaks down dead material and returns the substances to the environment is BACTERIA, which is option C.
BACTERIA especially those that lives in soil are saprophytic in nature. This means that they feed on dead decaying organisms and their excreta (wastes such as urine and faeces) and bring about their decay or decomposition. This occurs through the following'
• they secrete enzymes onto their food source such as a decaying leaf,
• these enzymes break down complex compounds like carbohydrates and proteins into simple inorganic compounds.
• a lot of chemical energy is lost as unusable heat energy.
• the decomposers (bacteria) only absorb a small amount of nutrients and energy for their use
• the rest is then released into the soil, air and water.
Therefore, the organism that breaks down dead material and returns the substances to the environment is BACTERIA.
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Antinomycin A is a poison that affects the electron transport chain and renders it nonfunctional. In the presence of Antinomycin the Citric Acid Cycle would:
Answer: options are not given, here are the options.
Speed up
Slow down
Remain the same
The correct answer is In the presence of Antinomycin the Citric Acid Cycle would SLOW DOWN.
Explanation:
Actinomycin is an antibiotics gotten from streptomyces which is use to inhibit which inhibit mitochondriisl eclectron transport chain.It is a poison that affect the electron transport chain, non functional and it slow down citric acid cycle because it has the ability to block the electron Transport chain thereby slowing down citric acid cycle because it inhibit or slow down succinate-cytochrome c reductase in the electron transport chain so as to block the oxidation of NADH and ATP production.
5)
In a lab, a group of students measured the temperature at which various substances boiled. Their results are listed in the
table.
Measurement in Lab (°C)
Accepted Value (°C)
100.7
101.8
seawater
359.6
370.0
mercury
jet fuel
ethanol (alcohol)
163.0
165.9
78.4
81.8
Which measurement has the highest percent error?
seawater
mercury
jet fuel
ethanol
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Answer:
Sea water
Explanation:
Because sea water has many impurities
Answer:
correct answer is Ethanol
Explanation:
Which of the following is not a possible effect of rising carbon dioxide levels on plants? a. increased photosynthesis b. increased plant mortality c. increased crop productivity d. increased plant growth Please select the best answer from the choices provided
Answer:
option D
Explanation:
how the plant growth will be enhanced, so it seems incorrect.
Answer: D on edg
Explanation:
Which statement best describes the main goal of a dichotomous key? to expand classifications and group organisms into larger categories to eliminate traits and group organisms into smaller categories to observe characteristics and discover new species to compare classifications and design new kingdoms
Answer:
to eliminate traits and group organisms into smaller categories to observe characteristics and discover new species to compare classifications .
According to me ,
it should be right.
Hope it helps.
How do auxins help plants to get sunlight?
A)Auxins help make plants grow longer in the shaded part causing the plant to bed towards the light.
B)When plants need more sunlight, it produces more auxins to attract light.
C)Auxins cause plants to grow bigger in order to capture more sunlight.
D)Auxins control how much light a plant can absorb.
My answer to the question is option A.
Answer:
The answer is A
A) Auxins help make plants grow longer in the shaded part causing the plant to bed towards the light.
Hope this helps!