Week 3 - Cells

Question 1

Which of the following is true?

Select one:

a. simple diffusion is a passive process
b. facilitation diffusion is an active process
c. endocytosis is a passive process
d. Sodium/potassium pump on the cell membrane always a passive process

Answer 1

a

Question 2

The plasma membrane (cell membrane) is:

Select one:

a. a single-layered membrane that surrounds the nucleus of the cell.
b. a double layer of protein enclosing the plasma.
c. the phospholipid bilayer surrounding the cell.
d. a membrane composed of tiny shelves or cristae.

Answer 2

c

Question 3

Which one of the following structure helps to remove mucus from the upper respiratory system?

Select one:

a. rugae
b. microvilli
c. cilia
d. flagella

Answer 3

c

Question 4

A red blood cell placed in pure water would:

Select one:

a. shrink.
b. swell initially, then shrink as equilibrium is reached.
c. neither shrink nor swell.
d. swell and burst.

Answer 4

d

Question 5

Which one of the following statements best describes what happens?

Select one:

a. A ribosome enters another organelle and uses the amino acids to form new protein.
b. A lysosome digests the unwanted substances.
c. The cytoplasm is made up of solid material.
d. Oxygen enters the nucleus and burns to release energy.

Answer 5

b

Question 6

Which of the following statements is correct regarding diffusion?

Select one:

a. The rate of diffusion is independent of temperature.
b. The greater the concentration of gradient, the faster the rate of diffusion.
c. Molecular weight of a substance does not affect the rate of diffusion.
d. The lower the temperature, the faster the diffusion rate.

Answer 6

b

Question 7

Mitosis:

Select one:

a. is also called asexual cell division
b. produce two unequal daughter cells
c. creates diversity in genetic potential.
d. division of cytoplasm only.

Answer 7

a

Question 8

Which of the following is a function of a plasma membrane protein?

Select one:

a. circulating antibody
b. transports molecules through the membrane
c. forms a lipid bilayer
d. oxygen transport

Answer 8

b

Question 9

If cells are placed in a hypertonic solution containing a solute to which the membrane is impermeable, what could happen?

Select one:

a. The cells will swell and ultimately burst.
b. The cells will lose water and shrink.
c. The cells will shrink at first, but will later reach equilibrium with the surrounding solution and return to their original condition.
d. The cells will show no change due to diffusion of both solute and solvent.

Answer 9

b

Question 10

Which one of the following tissues can actively regenerate?

Select one:

a. Nervous tissue
b. Epithelial tissue
c. Cardiac muscle tissue
d. skeletal muscle tissue

Answer 10

b

Question 11

Centrioles:

Select one:

a. affect motility.
b. affect the arrangement of the organelles.
c. participate in cell division.
d. help form the cell’s cytoskeleton.

Answer 11

c

Question 12

Organelles are present in the:

Select one:

a. Smooth ER.
b. Cell membrane
c. Cytoplasm
d. Nucleus

Answer 12

c

Question 13

Cell membranes are said to be

Select one:

a. impermeable
b. selectively permeable
c. actively permeable
d. freely permeable

Answer 13

b

Question 14

A solution that contains a lower solute concentration than the cytoplasm of a cell is called

Select one:

a. Isotonic
b. Hypotonic
c. Hypertonic
d. Ginantonic

Answer 14

b

Question 15

Which of the following is not a subcellular structure?

Select one:

a. intercellular material
b. membranes
c. cytoplasm
d. organelles

Answer 15

a

Question 16

The movement of water across a membrane from an area of low solute concentration to an area of higher solute concentration is known as

Select one:

a. Osmosis
b. Diffusion
c. Active transport
d. Filtration

Answer 16

a

Question 17

Which of the following would not be a constituent of a plasma membrane?

Select one:

a. glycolipids
b. messenger RNA
c. glycoproteins
d. phospholipids

Answer 17

b

Question 18

Which of the following statements is TRUE:

Select one:

a. Active transport involves substances transported across the membrane without using energy
b. Passive transport involves substances transported across the membrane using energy
c. Exocytosis is an example of active transport
d. Facilitated diffusion is an example of active transport

Answer 18

c

Question 19

The basic building blocks of DNA are:

Select one:

a. chromosomes
b. nucleotides
c. nucleosomes
d. chromatin

Answer 19

b

Question 20

Which one of the following consists of enzymes?

Select one:

a. microtubules
b. lysosome
c. micro skeleton
d. cilia

Answer 20

b

Question 21

A process that requires cellular energy to move a substance against its concentration gradient is called

Select one:

a. Active transport
b. Facilitated diffusion
c. Diffusion
d. Osmosis

Answer 21

a

Question 22

Passive transport processes include:

Select one:

a. movement of a substance down its concentration gradient.
b. movement of water from an area of more concentrated solution to an area of less concentrated one.
c. consumption of ATP.
d. the use of transport proteins when moving substances from areas of low to high concentration.

Answer 22

a

Question 23

The process by which molecules such as glucose are moved into cells along their concentration gradient with the help of membrane carrier proteins is called

Select one:

a. Endocytosis
b. Exocytosis
c. Facilitated diffusion
d. Active transport

Answer 23

c

Question 24

Facilitated diffusion is limited by

Select one:

a. the amount of carrier molecules available
b. the amount of energy available.
c. both a and b
d. neither a nor b

Answer 24

a

Question 25

Phospholipids:

Select one:

a. are exclusively hydrophilic molecules.
b. contain polar tails and nonpolar head groups.
c. are both hydrophilic and hydrophobic in nature.
d. form the lipid bilayer, with tails directed to the outside.

Answer 25

c

Question 26

A membrane that allows certain things to enter while preventing others is termed:

Select one:

a. semi-permeable membrane
b. non-semipermeable membrane
c. fully permeable membrane.
d. active membrane

Answer 26

a

Question 27

The cell’s DNA is located in the

Select one:

a. ribosomes
b. nucleus
c. nucleolus
d. lysosomes

Answer 27

b

Question 28

Active transport is involved in:

Select one:

a. endocytosis
b. exocytosis
c. both a and b
d. none of the above

Answer 28

c

Question 29

Which of the following is true regarding cells in humans?

Select one:

a. Organelles are independent life forms.
b. Maximum cell diameter is limited to 2 micrometers.
c. A neuron can be as long as 1 metre.
d. All cells of an adult have a very short life span.

Answer 29

c

Question 30

The cell membrane can best be structurally described as:

Select one:

a. a single phospholipid layer with proteins embedded
b. a triple phospholipid layer with proteins embedded
c. phospholipid bilayer with proteins embedded
d. carbohydrate bilayer with proteins embedded

Answer 30

c