Question 1

Which cellular structure is primarily responsible for regulating the movement of substances into and out of the cell, as depicted in Fig 3.2?

Accepted Answer

Plasma membrane

Question 2

A cell is placed in a solution with a higher solute concentration than its cytoplasm. According to Fig 3.7, what will happen to the cell?

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 3

Which process, illustrated in Fig 3.10, involves the selective uptake of molecules based on specific cell surface receptors?

Accepted Answer

Receptor-mediated endocytosis

Question 4

During protein synthesis (Fig 3.15), which organelle is responsible for packaging proteins for secretion?

Accepted Answer

Golgi apparatus

Question 5

In translation (Fig 3.20), what is the correct sequence of events?

Accepted Answer

mRNA binds to ribosome, tRNA brings amino acids, peptide bonds form

Question 6

Which equation best represents osmotic pressure ($$\Pi) as it $$relates to the movement of water across a plasma membrane (Fig 3.7)?

Accepted Answer

$$\Pi = RTC$$

Question 7

A mutation prevents the formation of clathrin-coated pits during receptor-mediated endocytosis (Fig 3.10). What is the most likely consequence?

Accepted Answer

The cell will be unable to selectively internalize certain molecules.

Question 8

Which step in DNA replication (Fig 3.22) ensures that each daughter cell receives an identical set of genetic information?

Accepted Answer

Complementary base pairing

Question 9

If a cell's plasma membrane becomes more permeable to sodium ions, what effect will this have on osmotic flow (Fig 3.7)?

Accepted Answer

Water will move into the cell, increasing cell volume.

Question 10

Which formula describes the rate of diffusion ($$J) $$across a plasma membrane, relevant to Fig 3.7?

Accepted Answer

$$J = -D \frac{dC}{dx}$$

Question 11

A patient with familial hypercholesterolemia has defective LDL receptors. Based on Fig 3.10, which cellular process is impaired?

Accepted Answer

Receptor-mediated endocytosis

Question 12

During protein synthesis (Fig 3.15), which molecule carries the genetic code from the nucleus to the ribosome?

Accepted Answer

mRNA

Question 13

Which equation represents the relationship between the number of amino acids ($$n) $$and the length of the polypeptide chain ($$L) $$during translation (Fig 3.20)?

Accepted Answer

$$L = n$$

Question 14

If DNA replication (Fig 3.22) is inhibited, which cellular process will be directly affected?

Accepted Answer

Cell division

Question 15

Which of the following best describes the function of ribosomes during translation (Fig 3.20)?

Accepted Answer

They synthesize proteins by linking amino acids together.

Question 16

A cell exposed to a hypotonic solution will experience which of the following, according to Fig 3.7?

Accepted Answer

Water will enter the cell, causing it to swell.

Question 17

Which step in protein synthesis (Fig 3.15) involves the conversion of mRNA sequence into a polypeptide chain?

Accepted Answer

Translation

Question 18

Which equation represents the base pairing rule in DNA replication (Fig 3.22)?

Accepted Answer

$$A = T$$, $$C = G$$

Question 19

A cell lacking functional Golgi apparatus would have difficulty with which process, as shown in Fig 3.15?

Accepted Answer

Packaging and modifying proteins for secretion

Cell Structure and Function: Key Processes and Mechanisms

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