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IgorC [24]
3 years ago
5

How does phospholipid structure relate to the selective permeability of the plasma membrane? a critical feature of the plasma me

mbrane is that it is selectively permeable. this allows the plasma membrane to regulate transport across cellular boundaries--a function essential to any cell's existence. how does phospholipid structure prevent certain molecules from crossing the plasma membrane freely?
Biology
1 answer:
Katen [24]3 years ago
8 0
The structure of plasma membrane makes it selectively permeable allowing it to regulate the passage of substances into and out of the cell. Small nonpolar molecules can easily across the phospholipid bilayer of plasma membrane because it is hydrophobic. Polar molecules and ion cannot easily across the hydrophobic portion of plasma membrane because it is hydrophilic. Polar molecules and ions usually across the plasma membrane with the help of transport proteins.
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Please answer asap !!!! and yeah please hehe
lesantik [10]

Answer:

looks like a nucleotide

Explanation:

going with nucleotide!

3 0
3 years ago
In fruit flies, one genotype for red eyes is written XRXR. The R stands for the dominant allele for red eyes. What does the X st
Reil [10]

Answer:

The correct answer is : the female chromosome

Explanation:

  • According to the question, it is mentioned that R is a dominant allele, responsible for the red eyes.
  • RR is a genotype for Red eyes.
  • A fruitfly has a diploid genotype which means each trait is represented by a pair of chromosomes.
  • In the above question, the dominant red eye colour trait is represented by the pair of chromosomes RR.
  • Therefore, XX must represent another trait.
  • By convention, a pair of X chromosomes (XX) represent a female and a combination of X and Y chromosomes (XY) represents a male.
  • Given XX genotype represent a female fruitfly chromosome.

6 0
3 years ago
What is a good example of a response-based definition of stress?
TEA [102]

Answer:

What is a good example of a response-based definition of stress?

Bruce experiences stress because his heart rate increased when he noticed Jack had a knife.

Explanation:

Stress can have many different causes. In this case, it is produced by seeing danger in Jack by having a knife. His heart rate increases because this is a common response in stress, which would enable people to scape. It is important to control stress lebels.

A stressor is distinguished as a threat. If someone anticipates that it could lead to some kind of harm, loss, or other negative consequence. However, if you see the positive side and believe that it carries the potential for gain or personal growth, it would be appraised as a Challenge.

4 0
3 years ago
What is the major component missing from this food chain in order to see the flow of energy? A) there are no producers B) there
solmaris [256]

Answer:

The Green plants are missing in the food chain

Explanation:

Producers: The green plants since they produce their own food are also termed as autotrophs. They absorb energy from the sun to make their food. In ocean the phytoplanktons are the producers. In oceans the zooplanktons eat the phytoplanktons. Again the smaller zooplanktons eaten by larger zooplanktons and this eaten by fish. The fish is eaten by a bird. The tertiary consumer.

Consumers: It includes all organism eat something to survive. They might be herbivores and carnivores

Decomposer: The microbes bacteria and fungi converts dead matter into carbon and nitrogen which backs into the atmosphere.

5 0
3 years ago
What is true concerning hemoglobin.
Fynjy0 [20]

Answer:

A protein molecule present in the RBCs, which helps in the transportation of oxygen from the lungs to the different parts of the body and brings back carbon dioxide, that is, collected from different parts of the body back to the lungs is known as hemoglobin.  

The general features of hemoglobin are that it comprises four molecules of protein in the form of globulin chains. In adults, the molecules of hemoglobin comprise two beta-globulin chains and two alpha globulin chains, while in infants and fetuses, the beta chains are least found, and is substituted by two gamma chains.  

Each globulin chain comprises an essential iron-containing compound porphyrin, which is termed as heme. Together both iron and heme play an essential role in circulating oxygen and carbon dioxide in the blood. This iron gives the red appearance to the blood.  

6 0
3 years ago
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