Chapter 4 - Cell Structure

Question 1

The __________ is the smallest unit of life.

Answer 1

cell

Question 2

Every cell is descended from another cell. This idea is part of __________.

a. evolution
b. the theory of heredity
c. the cell theory
d. cell biology

Answer 2

c. the cell theory

Question 3

True or false? Some protists have no nucleus.

Answer 3

False

Question 4

Cell membranes consist mainly of a _____________.

a. carbohydrate bilayer and proteins
b. protein bilayer and proteins
c. lipids bilayer and proteins

Answer 4

c. lipid bilayer and proteins

Question 5

Unlike eukaryotic cells, bacterial cells ______________.

a. have no plasma membrane
b. have RNA but not DNA
c. have no nucleus
d. a and c

Answer 5

c. have no nucleus

Question 6

In a lipid bilayer, ________________ of all the lipid molecules are sandwiched between all the __________.

a. hydrophilic tails; hydrophobic heads
b. hydrophilic heads; hydrophilic tails
c. hydrophobic tails; hydrophilic heads
d. hydrophobic heads; hydrophilic tails

Answer 6

c. hydrophobic tails; hydrophilic heads

Question 7

Enzymes contained in ___________ break down worn-out organelles, bacteria, and other particles.

Answer 7

lysosomes

Question 8

Put the following structures in order according to the pathway of a secreted protein:

a. plasma membrane
b. Golgi bodies
c. endoplasmic reticulum
d. post-Golgi vesicles

Answer 8

c, b, d, a

Question 9

The main function of the endomembrane system is building and modifying ___________ and __________.

Answer 9

lipids and proteins

Question 10

Is this statement true or false? The plasma membrane is the outermost component of all cells. Explain.

Answer 10

False. Some secret a covering

Question 11

Most membrane functions are performed by ____________.

a. proteins
b. phospholipids
c. nucleic acid
d. hormones

Answer 11

a. proteins

Question 12

No animal cell has a ___________.

a. plasma membrane
b. flagellum
c. lysosome
d. cell wall

Answer 12

d. cell wall

Question 13

____________ connect the cytoplasm of plant cells.

a. Plasmaodestmata
b. Adhering junctions
c. Tight junctions
d. a and b

Answer 13

a. Plasmaodesmata

Question 14

Match each cell component with its function.

\_\_\_ mitochondrion 
\_\_\_ chloroplast
\_\_\_ ribosome
\_\_\_ smooth ER
\_\_\_ Golgi body
\_\_\_ rough ER

a. protein synthesis
b. associates with ribosomes
c. ATP production
d. sorts and ships
e. assembles lipids
f. photosynthesis

Answer 14

c
f
a
e
d
b