Quiz 3

Question 1

Which of the following is mismatched?

Plasmalemma – a selective barrier important in communication among cells and between cells and their external environment.

Cytoplasm – Consists of the cellular contents between the plasmalemma and the nucleus.

Cytosol - contains a single molecule of DNA.

Nucleus – control center of the cell.

Answer 1

Cytosol - contains a single molecule of DNA.

Question 2

Osmotic pressure is a measure of the tendency of water to move into a more concentrated solution.

True
False

Answer 2

True

Question 3

________ is a state of high metabolic activity in which the cell does most of its growing.

Interphase

Anaphase

Metaphase

Prophase

Telophase

Answer 3

Interphase

Question 4

The electrochemical gradient is due to the fact that the membrane is selectively permeable.

True
False

Answer 4

True

Question 5

Which of the following statements is incorrect?

Transcription occurs in the nucleus of the cell while translation occurs at the ribosome.

Transcription involves transfer RNA which is formed from a DNA template.

Translation involves messenger RNA which is read at the ribosome.

Transfer RNA brings amino acids to the ribosome to be added to the protein .

Answer 5

Transcription involves transfer RNA which is formed from a DNA template.

Question 6

The key difference between active and passive processes is that passive processes require energy.

True
False

Answer 6

False

Question 7

Simple diffusion and facilitated diffusion differ in that facilitated diffusion requires assistance of a membrane protein to move substances across a membrane.

True
False

Answer 7

True

Question 8

These structures are surrounded by cytosol and perform specialized functions within the cell.

chromosomes

organelles

plasma membranes

nuclei

Answer 8

organelles

Question 9

Which one of these statements is incorrect?

A cell placed in a hypotonic solution would swell and perhaps burst.

A red blood cell placed in an isotonic solution would stay the same shape.

A cell placed in a hypotonic solution would undergo crenation.

A cell placed in an hypertonic solution would undergo crenation.

Answer 9

A cell placed in a hypotonic solution would undergo crenation.

Question 10

The plasmalemma allows some substances to pass through more readily than others. This property is referred to as ________.

Selective permeability

Phagocytosis

Active transport

Endocytosis

Answer 10

Selective permeability