Cells: The Living Units

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1

The intracellular fluid packed with the organelles of a cell is called _______.

a. plasma
b. nucleus
c. phospholipid
d. cytoplasm

d. cytoplasm

2

The cell membrane is composed mostly of ________.

a. proteins and steroids
b. phospholipids and steroids
c. phospholipids and proteins
d. carbohydrates and steroids

c. phospholipids and proteins

3

The smallest unit of life is the ________.

a. cell
b. organelle
c. nucleus
d. DNA

a. cell

4

The interior of the cell membrane can best be described as ________.

a. hydrophilic
b. hydrophobic
c. hydrated
d. polar

b. hydrophobic

5

Cell junctions that are important in cell communication are _______.

a. tight junctions
b. gap junctions
c. desmosomes
d. plaques

b. gap junctions

6

Which of the following is not an example of passive transport?

a. Diffusion
b. Facilitated diffusion
c. Pinocytosis
d. Osmosis

c. Pinocytosis

7

If you walk into your house and smell dinner, you are experiencing ________.

a. diffusion
b. osmosis
c. facilitated diffusion
d. active transport

a. diffusion

8

Diffusion requires _______.

a. a membrane
b. protein carriers
c. energy
d. none of the above

d. none of the above

9

A cell that is placed in a hypertonic solution will ______.

a. burst
b. crenate
c. remain the same
d. hydrate

b. crenate

10

In comparison to cells, _________ solutions contain a lower concentration of nonpenetrating particles.

a. osmotic
b. hypertonic
c. isotonic
d. hypotonic

d. hypotonic

11

Which of the following is not an example of vesicular transport?

a. Active transport
b. Phagocytosis
c. Exocytosis
d. Pinocytosis

a. Active transport

12

A cell will "drink" small amounts of fluid and solutes using _______.

a. pinocytosis
b. phagocytosis
c. facilitated diffusion
d. exocytosis

a. pinocytosis

13

Specifically, which type of transport is driven by energy stored in gradients?

a. Symport transport
b. Primary active transport
c. Secondary active transport
d. Antiport transport

c. Secondary active transport

14

How is active transport different from facilitated diffusion?

a. It is specific.
b. It is reversible.
c. It exhibits saturation.
d. It moves against the concentration
gradient.

d. It moves against the concentration
gradient.

15

Which molecules would most likely be actively transported?

a. Water molecules
b. Amino acids
c. Molecules moving to a lower concentration
d. Hydrophobic molecules

b. Amino acids

16

In a cell, proteins are synthesized at the ________.

a. Golgi apparatus
b. mitochondrion
c. smooth endoplasmic reticulum
d. ribosome

d. ribosome

17

In a cell, ATP is produced by the _________.

a. Golgi apparatus
b. mitochondrion
c. rough endoplasmic reticulum
d. ribosome

b. mitochondrion

18

These structures bud off the Golgi apparatus.

a. Ribosomes
b. Lysosomes
c. Peroxisomes
d. Phagosomes

b. Lysosomes

19

Which cytoskeletal element attaches to desmosomes to resist pulling forces exerted on the cell?

a. Microtubules
b. Macrotubules
c. Intermediate filaments
d. Microfilaments

c. Intermediate filaments

20

These organelles are fatal to the cell if they burst.

a. Ribosomes
b. Centrioles
c. Mitochondria
d. Lysosomes

d. Lysosomes

21

Mitosis is the division of the _______.

a. cell
b. cytoplasm
c. nucleus
d. all of the above

c. nucleus

22

Cytokinesis is defined as _________.

a. the division of the cell
b. the formation of a cleavage furrow
c. the division of the cytoplasm
d. the telophase stage of mitosis

c. the division of the cytoplasm

23

DNA is replicated during which stage of interphase?

a. Gap zero
b. Gap one
c. Gap two
d. S phase

d. S phase

24

If a cell has 8 chromosomes before mitosis, each daughter cell will have how many chromosomes?

a. 2
b. 4
c. 8
d. 16

c. 8

25

Semiconservative replication refers to: ________.

a. one old and one new nucleotide strand in each
new DNA molecule
b. the equal splitting of the cytoplasm during
cytokinesis
c. the production of two genetically identical
daughter cells at the end of mitosis
d. the conservation of energy during mitosis and
cytokinesis

a. one old and one new nucleotide strand in each
new DNA molecule

26

What is the function of primary cilia?

a. Propel the cell
b. Move substances in one direction across cell
surfaces
c. Probe the external environment for molecules
their receptors can recognize
d. Increase the surface area

c. Probe the external environment for molecules
their receptors can recognize