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Difficult Multiple Choice
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1
The plasma membrane is effective in isolating the cytoplasm from the extracellular fluid primarily because
A)peripheral proteins are attached to the inner or outer membrane surface
B)integral proteins form channels that let water pass in and out of the cell
C)the lipid "tails" in the phospholipid bilayer form a sheet that repels water
D)the rigid composition of the plasma membrane forms a waterproof barrier
2
Of all the passive processes, the only one that does not require a concentration gradient is
A)diffusion
B)osmosis
C)bulk filtration
D)facilitated diffusion
3
A transport or carrier protein
A)spans the plasma membrane completely and is thus a transmembrane protein
B)has an internal hydrophobic region and hydrophilic regions at both ends
C)may use energy from ATP to help a particular substance cross the plasmalemma
D)all of the above
4
What must happen when a concentration gradient is eliminated?
A)molecular motion ceases
B)active transport begins
C)diffusion and osmosis stop
D)all of the above
5
Which one of the following processes can only occur in a living cell?
A)diffusion
B)osmosis
C)bulk filtration
D)endocytosis
6
All of the following are directly associated, at least in part, with the lipid components of the plasma membrane except
A)molecular bilayer framework
B)cholesterol molecules
C)catalytic enzymes
D)glycocalyx
7
A higher concentration of sodium ions in extracellular fluid versus cytosol is most likely maintained by
A)blocking any passage of sodium through the plasma membrane
B)actively transporting sodium ions out of the cell
C)overcrowding the cytosol with potassium ions
D)none of the above
8
Which of the following lists only non-membrane-bound organelles?
A)microvilli, ribosomes, centrioles, mitochondria, cytoskeleton
B)cytoskeleton, microvilli, centrioles, cilia, flagellum, ribosomes
C)microvilli, cytoskeleton, cilia, lysosomes, nucleus, ribosomes
D)cytoskeleton, endoplasmic reticulum, centrioles, nucleus, cilia, ribosomes
9
Which of the following lists only membrane-bound organelles?
A)microtubules, nucleus, lysosomes, ribosomes, mitochondria, cilia
B)lysosomes, ribosomes, peroxisomes, endoplasmic reticulum, Golgi apparatus
C)endoplasmic reticulum, Golgi apparatus, mitochondria, lysosomes, peroxisomes
D)mitochondria, cilia, centrioles, Golgi apparatus, endoplasmic reticulum, nucleus
10
Which one of the following organelles occurs in the fewest types of human cells?
A)nucleus
B)microtubule
C)flagellum
D)rough ER
11
Which of the following organelles are found in all living cells of the human body?
A)nuclei
B)nucleoli
C)microvilli
D)microtubule
12
The nucleus (and more specifically, the genes it contains) most directly controls all of the cell's activities by
A)controlling cell division
B)regulating protein synthesis
C)synthesizing DNA and RNA
D)coordinating intracellular communication
13
Of the following, which organelle participates most directly in mitosis?
A)smooth endoplasmic reticulum
B)ribosome
C)centriole
D)nucleolus
14
Which series progresses from the thinnest to the thickest in diameter?
A)DNA > histone > chromosome > nucleosome
B)histone > chromosome > DNA > nucleosome
C)nucleosome > histone > DNA > chromosome
D)DNA > histone > nucleosome > chromosome
15
Although often described as somatic cell division, ____________ is actually division of the nucleus.
A)meiosis
B)mitosis
C)cytokinesis
D)interphase
16
Mitosis plays a role in all of the following processes except
A)tissue growth and repair
B)replacement of old or dying cells
C)sex cell production
D)embryo formation
17
In an adult, which of the following usually have the longest G0 phase?
A)blood cells
B)nerve cells
C)epithelial skin cells
D)the G0 phase is the same length in all of these
18
The longest part of a mature muscle cell's life cycle is
A)the G2 phase
B)the S phase
C)interphase
D)mitosis
19
During which stages of mitosis does a typical cell contain twice its normal number of chromosomes? (1) prophase (2) metaphase (3) anaphase (4) telophase
A)1 and 2
B)2 and 3
C)3 and 4
D)all of the above
20
Which of the following organelles might function during or even after apoptosis of the cell that contains them?
A)centrioles
B)Golgi apparatus
C)rough endoplasmic reticulum
D)lysosomes
21
Which property of cancer cells most directly contributes to metastasis?
A)invasiveness
B)dedifferentiation
C)production of angiogenesis factors
D)loss of contact inhibition
22
____________ is caused by a genetic defect in mitochondrial rather than nuclear DNA.
A)cystic fibrosis
B)MELAS syndrome
C)adrenoleukodystrophy
D)Tay-Sachs disease
23
If organelles can proliferate in response to increased demand, then one could expect to find far more ____________ in the liver cells of an alcoholic than in a nondrinker.
A)rough ER
B)smooth ER
C)mitochondria
D)lysosomes
24
Which of the following cellular changes would generally be indicative of cancer?
A)anaplasia
B)hyperplasia
C)hypertrophy
D)all of the above
25
To destroy bacteria in the interstitial fluid, leukocytes would most likely employ the process of
A)receptor-mediated endocytosis
B)pinocytosis
C)bulk filtration
D)phagocytosis







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