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Multiple Choice Feedback Quiz
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1

Which of the following statements is(are) true about the cyanobacteria?
A)Cyanobacteria appeared about 3 billion years ago.
B)Cyanobacteria produce methane.
C)The presence of cyanobacteria increased the concentration of free oxygen.
D)Both a and c are correct.
2

Bacteria are responsible for
A)Cycling minerals within the ecosystem.
B)Introducing oxygen into the atmosphere.
C)Deadly diseases.
D)all of the above
3

Which of the following is not a characteristic of bacterial cells?
A)Bacterial cells are eukaryotic.
B)Bacterial cells do not have an organized nucleus.
C)Bacterial cells have a cell wall.
D)Bacterial cells have a single strand of DNA.
4

When exposed to harsh conditions, some bacteria form
A)capsules.
B)endospores.
C)pili.
D)flagella.
5

Which one of the following statements is not true about bacteria and eukaryotes?
A)Eukaryotes are larger than bacteria.
B)Bacteria lack internal compartmentalization.
C)Both types of organisms reproduce by mitosis.
D)The flagella of bacteria are less complex than those of eukaryotes.
6

Archaebacteria and eubacteria differ.
A)in the structure of the cell wall.
B)in the structure of the plasma membrane.
C)in the kinds of ribosomal proteins they possess.
D)in all of the above
7

You might find methanogens
A)in swamps.
B)in a cow's stomach.
C)in the Great Salt Lake.
D)in all of the above
8

Nitrogen fixation occurs within
A)heterocysts.
B)methanogens.
C)archaebacteria.
D)thermoacidophiles.
9

All of the following diseases are caused by bacteria except
A)plague.
B)yellow fever.
C)cholera
D)tuberculosis.
10

The basic structure of a virus contains
A)a nucleic acid
B)a cell wall
C)a protein coat
D)both a and c
11

Gram-positive bacteria have an outer membrane that stains purple.
A)true
B)false
12

During the process of conjugation, a copy of a DNA strand is passed from one bacterium to another.
A)true
B)false
13

Biologists feel that eukaryotes evolved from the eubacteria.
A)true
B)false
14

Viruses are more closely related to chemical matter than to a living organism.
A)true
B)false
15

New strains of influenza continually arise because the virus mutates the gene encoding the glycoprotein that makes it resistant to antibiotics.
A)true
B)false
16

The HIV virus uses the host cell's reverse transcriptase to manufacture DNA.
A)true
B)false
17

Some viruses enter the cell through endocytosis.
A)true
B)false
18

The most lethal virus in human history has been the influenza virus.
A)true
B)false
19

HIV binds to the human white blood cell receptor protein CD4.
A)true
B)false
20

Currently there are approximately 2 million cases of HIV worldwide.
A)true
B)false





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