Question 1

The boundary between the inside and outside of a cell is provided by the

Accepted Answer

A)  Cell membrane 
B)  Endoplasmic reticulum mem brane 
C)  Mitochondrial membrane 
D)  Nuclear Envelope 
E)  Cytoskeleton A

Question 2

Kinesin and dynein move vesicles and other cargo along tracts composed of

Accepted Answer

A)  Myosin 
B)  Desmin 
C)  Actin 
D)  Tubulin 
E)  Intermediate filaments D

Question 3

The concentration of solutes in the cytoplasm of most cells follows which of the following order, from grea test to least:

Accepted Answer

A)  Na>K>ATP>Ca 
B)  K>Na>ATP>Ca 
C)  Na>K>Ca>ATP 
D)  Na>ATP>K>Ca 
E)  ATP>Na>K>Ca B

Question 4

Purified subcellular organelles are most often isolated by

Accepted Answer

A)  Electron microscopy 
B)  Differential centrifugation 
C)  Free zone electrophoresis 
D)  Light microscopy 
E)  Bouyant density centrifugation

Question 5

Of the following, the organelle most involved in the synthesis of lipids is the

Accepted Answer

A)  Rough endoplasmic reticulum 
B)  Smooth endoplasmic reticulum 
C)  Golgi apparatus 
D)  Peroxisome 
E)  Endosome

Question 6

Most of the oxygen consumption of human cells occurs in the

Accepted Answer

A)  Cytosol 
B)  Peroxisomes 
C)  Lysosomes 
D)  Nucleus 
E)  Mitochondria

Question 7

Proteasomes degrade proteins that are "tagged" by

Accepted Answer

A)  Myristoylation 
B)  Palmitoylation 
C)  Formation of disulfide bonds 
D)  Farnesylation 
E)  Ubiquitinylation

Question 8

Gap junctions are formed by

Accepted Answer

A)  Integrins 
B)  Cadherins 
C)  Desmoplakin 
D)  Connexin 
E)  Plakophilin

Question 9

The Svedberg is defined as

Accepted Answer

A)  kT /D 
B)  6$\pi$ $ \eta $ a 
C)  $ \omega $2r/g 
D)  (dr/dt) / $\omega$2r 
E)  -$\beta$ v

Question 10

Which are NOT one of the ways that cells connect to each other?

Accepted Answer

A)  Gap junction 
B)  Adherens junction 
C)  Desmosome 
D)  Zonula occludens 
E)  Connectosome

Question 11

The relative centrifugal force is given as

Accepted Answer

A)  kT /D 
B)  6$\pi$ $ \eta $ a 
C)  $ \omega $2r/g 
D)  (dr/dt) / $\omega$2r 
E)  -$\beta$ v

Question 12

Double membranes are part of the structure of

Accepted Answer

A)  The endoplasmic reticulum 
B)  The mitochondria 
C)  The peroxisome 
D)  The Golgi apparaturs 
E)  The cytoskeleton

Question 13

The endosymbiotic hypothesis proposes that

Accepted Answer

A)  Lysosomes fuse with endocytotic vesicles to form secondary lysosomes 
B)  Phagocytosis was a precursor to the gastrointestinal system 
C)  Secondary active transport is necessary for life 
D)  Mitochondria originated from engulfment of aerobic bacteria 
E)  The nucleus was once a separate cell

Question 14

Cells adhere to each other through all of the following junctions EXCEPT

Accepted Answer

A)  Desmosomes 
B)  Gap junctions 
C)  Zonula adherens 
D)  Zonula occludens 
E)  Zonula cadhera

Question 15

W hich of the following supports the endosymbiotic hypothesis

Accepted Answer

A)  Mitochondria contain circular DNA separate from nuclear DNA 
B)  Mitochondria consume oxygen 
C)  Lysosomes contain hydrolytic enzymes 
D)  Mitochondria import proteins from the cytoplasm 
E)  Ribosomes contain RNA

Question 16

Intermediate filaments differ from the other cytoskeletal filaments in that

Accepted Answer

A) Intermediate filaments have a polarity (+ and - ends) 
B)  Intermediate filaments are dynamic along their entire length, not just the ends 
C)  They are approximately 100 nm in diameter 
D)  Intermediate filaments are polymers of globular monomeric proteins 
E)  Intermediate filaments do not differ from the other cytoskeletal elements except in size

Question 17

All of the following organelles of the cell have mem branes that enclose a space except

Accepted Answer

A)  Mitochondria 
B)  Peroxisomes 
C)  Cytoskeleton 
D)  Lysosomes 
E)  Nucleus

Question 18

Of the following, the organelle most involved with packaging and processing of secreted proteins is the

Accepted Answer

A)  Endoplasmic reticulum 
B)  Peroxisome 
C)  Golgi apparatus 
D)  Nucleus 
E)  Mitochondria

Exam 6: Cell Structure