Question 1

Eukaryotic cells add rigidity to their plasma membrane by including what component in the membrane

Accepted Answer

A)   protein
B)   lipids
C)   sugars
D)   sterols D

Question 2

Osmosis most directly involves

Accepted Answer

A)   water moving down a concentration gradient
B)   organic molecules crossing a membrane
C)   energy being expended to import large molecules into the cell
D)   sugars and salts moving down their concentration gradient A

Question 3

The outer (cell)membrane component of the cell wall

Accepted Answer

A)   is found only in Gram positive bacteria
B)   is made primarily of peptidoglycan
C)   contains lipopolysaccharrides
D)   is primarily a reproductive structure C

Question 4

Which of the following statements about a prokaryotic cell's surface-to-volume ratio is false?

Accepted Answer

A)   because of their small size, bacteria have a small surface-to-volume ratio
B)   eukaryotes have a surface-to-volume ratio that is only 1/10 that of prokaryotes
C)   the prokaryote's surface-to-volume ratio means that nutrients can easily and quickly reach all parts of the cell as no internal part of the cell is very far from the surface.
D)   a bacteria with a surface area of about 12 microns squared and a volume of 4 cubic microns has a surface-to-volume ratio of 3:1

Question 5

The cytoskeleton consists of

Accepted Answer

A)   microfilaments and sterols
B)   microtubules and proteins
C)   microfilaments and microtubules
D)   sterols and proteins

Question 6

The most important component of bacterial cell walls is

Accepted Answer

A)   teicoic acid
B)   lipotechoic acid
C)   peptidoglycan
D)   glutamic acid

Question 7

The periplasmic space

Accepted Answer

A)   is found only in Gram positive organisms
B)   is found between the nuclear area and the cell membrane
C)   is found primarily in acid fast bacteria
D)   is found between the cell membrane and cell wall

Question 8

Three bags,permeable to water but not salt,are placed in beakers containing an isotonic,hypotonic and hypertonic solution. Describe how you could determine which beaker was which. If the bag were a cell what would happen to it if it was placed in each beaker.

Accepted Answer

The answer of Three bags,permeable to water but not salt,are...

Question 9

Attachment pili do all of the following except,

Accepted Answer

A)   help bacteria adhere to surfaces
B)   allow bacteria to form a pellicle at the air-water interface of a broth culture
C)   clump blood cells in a process called hemagglutination
D)   prevent the pathogenicity of certain bacteria

Question 10

An organic molecule which moves down its concentration gradient and across a pore in a cell membrane without energy being expended by the cell is experiencing

Accepted Answer

A)   simple diffusion
B)   osmosis
C)   active transport
D)   facilitated diffusion

Question 11

During diffusion,molecules

Accepted Answer

A)   move from hotter areas to cooler areas
B)   move from areas of higher concentration to areas of lower concentration
C)   move from areas of lower concentration to areas of higher concentration
D)   expend energy to move around

Question 12

Bacteria move by means of

Accepted Answer

A)   cilia
B)   flagella
C)   whipping back and forth
D)   pili

Question 13

The shape of a bacterial cell is determined (and maintained)by the

Accepted Answer

A)   cell membrane
B)   cell wall
C)   capsule
D)   slime layer

Question 14

Lysozyme,found in human tears,controls the growth of bacteria by

Accepted Answer

A)   fusing with vacuoles
B)   containing multiple kinds of digestive enzymes
C)   digesting peptidoglycan
D)   preventing peptidoglycan synthesis

Question 15

Which of the following is true about bacteria?

Accepted Answer

A)   all bacteria cells are smaller than 100 micrometers in diameter
B)   the cell wall controls the movement of small molecules into and out of the cell
C)   gram negative bacteria become protoplasts when their cell wall is digested away
D)   bacterial endospores are reproductive structures

Question 16

The rough endoplasmic reticulum appears rough because of

Accepted Answer

A)   sterols in its membrane
B)   fats and sugars on its surface
C)   multiple ribosomes on its surface
D)   proteins in the lumen of the ER

Question 17

Extrachromosomal DNA in prokaryotic cells can be found in the form of

Accepted Answer

A)   chromosomes
B)   plasmids
C)   mitochondria
D)   chloroplasts

Question 18

What supports the idea that prokaryotes were involved in the evolution of eukaryotes by means of endosymbiosis?

Accepted Answer

The answer of What supports the idea that prokaryotes were...

Question 19

Inclusions found in bacteria generally would not include

Accepted Answer

A)   granules
B)   volutin
C)   metachromatic granules
D)   ribosomes

Question 20

Genetic information in bacteria

Accepted Answer

A)   is found in the nucleus
B)   is found only in RNA
C)   is found in chromatin (ie DNA condensed by histones) 
D)   is sometimes found in the form of plasmids

Exam 4: Characteristics of Prokaryotic and Eukaryotic Cells