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ehidna [41]
3 years ago
14

When blood supplies oxygen and food to a cell surface and these molecules diffuse across, we might expect some "resting time." H

owever, if we inspected most cell membranes in a living human body, we would find a nearly continuous flow of substances back-and-forth across the plasma membrane. Which of the following is not a reason why? a) Cell metabolism is constantly using up oxygen and raw materials; this lowers their concentration so more will diffuse into the cell. b) Cell metabolism is constantly producing waste molecules; this increases their concentration so more will diffuse out of the cell. c) Cells produce useful secretions; this increases their concentration and more will diffuse out of the cell. d) Cell metabolism constantly produces carbon dioxide in respiration; this increases its concentration so more will diffuse out of the cell. e) Cells are living entities and in order to live can never "rest".
Biology
1 answer:
siniylev [52]3 years ago
8 0

Answer:

Option (e).

Explanation:

Blood is the main connective tissue of the body. Blood helps in the transport of oxygen, nutrients and the excretory product of the body. Blood also provides immunity as it contains white blood cells.

The resting time is expected during the diffusion process. But the substance continuous back and forth in the body. This is because cells are the main living entity of the organism. The cells are never at rest in order to live and their resting time is not possible.

Thus, the correct answer is option (e).

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Thepotemich [5.8K]

Answer:

Statement C is the only one that is necessarily true for exons 2 and 3. It is also true for exons 7 and 8. While statements A and B could be true, they don’thave to be. Because the protein sequence is the same in segments of the mRNA that correspond to exons 1 and 10, neither choice of alternative exons (2 versus 3, or 7 versus 8) can alter the reading frame. To maintain the normal reading frame—whatever that is—the alternative exons must have a number of nucleotides that when divided by 3 (the number of nucleotides in a codon) give the same remainder. Since the sequence of the a-tropomyosin gene is known, it is possible to check to see the actual state of affairs. Exons 2 and 3 both contain the same number of nucleotides, 126, which is divisible by 3 with no remainder.

4 0
2 years ago
Why do sex-linked traits follow different patterns of inheritance than other traits?
ANEK [815]

Answer:

I think option (C) is right answer

7 0
3 years ago
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6 0
3 years ago
During replication, which sequence of nucleotides would bond with the DNA sequence ATCAG?
andrew11 [14]

Answer:

TAGTC

Explanation:

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The bases pair like so:

A with T (adenine with thymine)

C with G (cytosine with guanine)

The DNA sequence given is :

ATCAG

Match As with Ts, Ts with As, Cs with Gs and Gs with Cs.

The sequence of nucleotides that would bond with the sequence above is:

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3 0
3 years ago
Which of the following pairs accurately connects a macromolecule to its monomer?
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The monomer of nucleic acids is nucleotide. This is correctly matched.

Hence, the correct answer is 'Option B - nucleic acids - nucleotides'.

7 0
3 years ago
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