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Flashcards in Review Questions Exam 1 Deck (33):
1

Which affirmative below is related to the
function of the ions in the cells?
A. It is the major fluid medium
B. It is a source of energy
C. It is a component of the plasma membrane
D. Are necessary for operation of the cellular control
mechanisms

Are necessary for operation of the cellular control
mechanisms

2

Which of the following is NOT a function of a
biological membrane?
A. Compartmentalization
B. Transport
C. Protein synthesis
D. Information Transmission

Protein synthesis

3

In which organelle occurs the production of ATP?
A. Lysosome
B. Endoplasmic Reticulum
C. Mitochondria
D. Golgi apparatus

Mitochondria

4

Which of the following is NOT an example of
simple diffusion?
A. Osmosis
B. Diffusion through protein transporters
C. Diffusion through the lipid bilayer
D. Diffusion through gated-channels

Diffusion through protein transporters

5

Which of the following is NOT true about
facilitated diffusion?
A. Is mediated by a carrier protein
B. No cellular energy is required
C. The rate of transport is proportional to the concentration of the diffusing substance
D. The rate of transport depend on the number of the carriers

The rate of transport is proportional to the concentration of the diffusing substance

6

Which of the following represents an example
of passive transport?
A. Glucose transporter
B. Sodium-Potassium pump
C. Sodium-glucose symport
D. Sodium-Hydrogen antiport

Glucose transporter

7

Steroid hormones are not ligands of cell
surface receptors.
A. True
B. False

True

8

Which of the following statements is NOT
true about second messengers:
A. They are generated in response to receptor activation
B. Calcium and cAMP are second messengers
C. cAMP is formed from AMP
D. There are only few second messengers systems within animal cells

cAMP is formed from AMP

9

Which of the following options is not a
function of the skeleton muscle?
A. Movement
B. Support for the skeleton
C. Digestion
D. Generation of body heat

Digestion

10

Elasticity is the ability to return to original
shape after being stretched.
A. True
B. False

True

11

Which of the following options is NOT true
about endomysium.
A. Is made from connective tissue
B. Is an extension from the epimysium
C. Is attached to the sarcolemma
D. Surround the muscle fiber

Is an extension from the epimysium

12

Each myofibril is composed by a linear series
of repeating _______________.
A. Muscle fibers
B. Myofilaments
C. Sarcolemmas
D. Sarcomeres

Sarcomeres

13

Which of the following organelles regulates
calcium storage, release and uptake?
A. Mitochondria
B. T tubules
C. Sarcoplasmic Reticulum
D. Nucleus

Sarcoplasmic Reticulum

14

How many motor neurons innervate each
muscle fiber?
A. 1
B. 2
C. 3
D. 4

1

15

Which of the following options is NOT a factor involved
in the generation of the membrane resting potential?
A. Active transport of Na
B. Active transport of K
C. Passive transport of K
D. Passive transport of proteins

Passive transport of proteins

16

During the depolarization phase of the action potential, the nerve cell membrane is more negative inside and more positive outside.
A. True
B. False

False

17

The sequence of changes related to the channels
responsible for the repolarization phase is:
A. Closing of Na Channels and closing of K Channels
B. Closing of Na channels and opening of K Channels
C. Opening of Na Channels and closing of K channels
D. Opening of Na channels and opening of K channels

Closing of Na channels and opening of K Channels

18

Which of the following options is NOT a source of
energy for skeletal muscle contraction?
A. Creatinine
B. Lipids
C. Protein
D. Glucose

Creatinine

19

Which of the following options is NOT an
example of passive transport?
A. Nicotinic Acetylcholine receptor
B. Calcium pump
C. Na leaking channel
D. K leaking channel

Calcium pump

20

Which of the following organelles regulates
calcium storage, release and uptake?
A. Mitochondria
B. T tubules
C. Sarcoplasmic Reticulum
D. Nucleus

Sarcoplasmic reticulum

21

In the resting stage of the action potential,
the membrane is depolarized.
A. True
B. False

False

22

Which of the following options is NOT a
component of the presynaptic terminal?
A. Neurotransmitter
B. Voltage gated-channel
C. Mitochondria
D. Ligand-gated channel

Ligand-gated channel

23

The sequence of changes related to the channels
responsible for the repolarization phase is:
A. Closing of Na Channels and closing of K Channels
B. Closing of Na channels and opening of K Channels
C. Opening of Na Channels and closing of K channels
D. Opening of Na channels and opening of K channels

Closing of Na channels and opening of K channels

24

What is the name of the enzyme responsible
for the destruction of Acetylcholine?

Acetylcholinesterase

25

Which molecule makes up the thick filament?
A. Actin
B. Myosin
C. Troponin
D. Tropomyosin

Myosin

26

Which intracellular protein in the smooth muscle cell
acts in the same way as troponin in the skeletal
muscle cell?

Calmodulin

27

During the depolarization phase of the action potential, the nerve cell membrane is more negative inside and more positive outside.
A. True
B. False

False

28

Hydrophilic signals ARE ligands of cell surface receptors.
A. True
B. False

True

29

Which enzyme is responsible for the cessation of
contraction in the smooth muscle tissue?

Myosin phosphatase

30

Which of the following options is NOT true
about multi-unit smooth muscle?
A. Each muscle fiber contract independently
B. It is located in the iris
C. It is innervated by autonomic fibers
D. It is also called visceral smooth muscle

It is also called visceral smooth muscle

31

During the power stroke, the myosin head has
an ATP molecule bound to it.
A. True
B. False

False

32

Which of the following molecules do not
diffuse directly through the cell membrane?
A. O2
B. CO2
C. H2O
D. K+

K+

33

Which of the following is NOT true about
facilitated diffusion?
A. Is mediated by a carrier protein
B. No cellular energy is required
C. The rate of transport is proportional to the concentration of the diffusing substance
D. The rate of transport depend on the number of the carriers

The rate of transport is proportional to the concentration of the diffusing substance