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MAXImum [283]
3 years ago
7

A small percentage of the body’s iron supply circulates freely in the blood, bound to a protein called transferrin. Transferrin

binds to specific proteins on the surfaces of a cell's plasma membrane. The cell then ingests the transferrin by forming a pit, which becomes a vesicle. Which of the following BEST describes how transferrin is transported across the plasma membrane? A. exocytosis B. pinocytosis C. phagocytosis D. receptor-mediated endocytosis
Biology
1 answer:
german3 years ago
4 0

Answer:

What best describes how transferrin is transported through the erythrocyte plasma membrane is receptor-mediated endocytosis.

Explanation:

The incorporation of transferrin across the erythrocyte membrane depends on a transferrin receptor expressed on the surface of the membrane. The specific receptor recognizes the presence of iron-charged transferrin, transferin diferrica, incorporating it into the cell by endocytosis. Once in the cytoplasm, the iron is dissociated from the transferrin.

Free transferrin is called apotransferrin. The transferrin receptor has a high affinity for transferrin di-ferrica, which facilitates its incorporation by endocytosis, and the release of apotransferrin into the extracellular space.

The other options are not correct because:

<em>     A. </em><u><em>Exocytosis</em></u><em> implies the exit of substances from the cell.</em>

<em>     B. </em><u><em>Pinocytosis</em></u><em> involves the invagination of the membrane to incorporate soluble substances into the cell.</em>

<em>     C. </em><u><em>Phagocytosis</em></u><em> is the incorporation of solid substances by invagination of the membrane.</em>

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Suppose that a portion of double-stranded DNA in the middle of a large gene is being transcribed by an RNA polymerase. As the po
babunello [35]

<u>Answer:</u>

CCGAGU

<u>Explanation:</u>

DNA transcription:

DNA transcription is the process through which DNA double helical strand is converted into single stranded RNA molecule.

During transcription two strands of DNA are named differently i.e Template strand and coding strand.

Template strand:

Strand from which RNA is producing is known as template strand while

Coding strand:

The strand which is opposite to the template strand is known as the coding strand. Coding strand is the DNA strand whose nucleotide sequence resembles to the RNA transcript base sequence except thymine which is replaced by uracil.

Correct Answer:

Template strand from 5' to 3' reads GGCTCA. and

In this question CCGAGT is coding strand.

RNA sequence is same as coding sequence except T which is replaced by U so sequence of RNA becomes

CCGAGU

8 0
3 years ago
Three of the same species of plant are each grown under a different colored light for the same amount of time. Plant A is grown
professor190 [17]

Answer:

A C B

Explanation:

Chlorophyll pigments absorb most of the light in the blue and red regions. Blue-violet region marks the peak absorption by chlorophyll a while chlorophyll b shows peak absorption in red blue light. Green colored light is not absorbed by chlorophyll a and b. Light absorption by chlorophyll is essential for the light-dependent phase of photosynthesis. Therefore the plant A grown under blue light will show maximum growth and plant B kept under green light would show minimum growth.

6 0
3 years ago
Read the following statements that describe how information flows in the nervous system.
anzhelika [568]
The answer is C<span>. 3,2,1,</span>
7 0
3 years ago
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Why is it, when shoppers go to the grocery store, the store offers customers either plastic or paper bags to carry their groceri
likoan [24]

Answer:

because they are plastic shopping bags are increasingly recyclable or biodegradable .Traditional plastic bags are usually made from polyethylene, which consists of long chains of ethylene monomers. Ethylene is derived from natural gas and petroleum. The polyethylene used in most plastic shopping bags is either low-density (resin identification code or, more often, high-density (resin identification code.Color concentrates and other additives are often used to add tint to the plastic. Plastic shopping bags are commonly manufactured by blown film extrusion.

Explanation:

5 0
3 years ago
Read 2 more answers
In fruit flies, eye color is a sex-linked trait. Red is dominant to white.
ozzi

Answer:

The correct answers are:

1 a. X^RX^r - red eye color female

b. X^RX^R - red eye color female

c. X^RY - red eye color male

d. X^rY - white eye color male

e. X^rX^r - white eye color female

(2nd part can also be answered by above)

Explanation:

It is given that the eye color is a sex-linked character where Red eye color is dominant over white eye color in fruit flies. Sex-linked characters are the character that is a similar inheritance pattern except in the case of the male as there is a Y chromosome that does not carry the gene for the eye color trait so the trait will depend on the allele present on a single  X chromosome in males.

On the basis of this, the sex and color of eyes will be:

a. X^RX^r - red eye color female - Dominant character will mask the recessive white color and two copies of X which means female.

b. X^RX^R - red eye color female - both copies are dominant so red-eye color will be expressed and two copies of the X chromosome that means female

c. X^RY - red eye color male - One X and one Y chromosome that means male and only dominant allele present so red eye color.

d. X^rY - white eye color male - Only allele that is present is recessive with one Y chromosome that means male with white eye color.

e. X^rX^r - white eye color female - two X chromosomes with recessive allele which means white eye color female.

7 0
3 years ago
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