7TH GRADE SCIENCE

test chapter 7

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CHAPTER 7

chapter 7

 

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

 

____           1.                Bacteria that live in places with a supply of oxygen are ____.

a.

anaerobic

c.

viruses

b.

aerobes

d.

capsules

 

 

____           2.                Of the following, where are archaebacteria NOT found?

a.

boiling hot springs

c.

freshwater ponds

b.

salty lakes

d.

cattle intestines

 

 

____           3.                Of these foods, which was NOT produced with the help of bacteria?

a.

milk

c.

yogurt

b.

cheese

d.

sauerkraut

 

 

____           4.                Harmful bacteria in food can be killed by ____.

a.

sunlight

c.

heat

b.

cold

d.

all of the above

 

 

____           5.                Bacteria are unlike plant and animal cells because they ____.

a.

are smaller

c.

have many organelles

b.

make their own food

d.

have a nucleus

 

 

____           6.                Peanuts and peas contain nitrogen-fixing bacteria in growths called ____.

a.

nodules

c.

filaments

b.

colonies

d.

chains

 

 

____           7.                An antibiotic is a drug used to kill ____.

a.

bacteria

c.

latent viruses

b.

cyanobacteria

d.

viruses

 

 

____           8.                Bacteria that are saprophytes use ____ as a food and energy source.

a.

nitrogen

c.

oxygen

b.

antibiotics

d.

dead material

 

 

____           9.                A process of the food industry that is used to kill harmful bacteria is ____.

a.

fission

c.

botulism

b.

sterilization

d.

vaccination

 

 

____         10.                Thick walls produced by some bacterial pathogens are called ____.

a.

endospores

c.

antibiotics

b.

saprophytes

d.

nitrogen-fixing

 

 

____         11.                Helpful bacteria can do all of the following EXCEPT ____.

a.

help clean up soils

c.

digest dead organisms

b.

preserve canned food

d.

make medicines

 

 

____         12.                It is estimated that nitrogen-fixing bacteria save farmers several million dollars in ____ costs each year.

a.

dairy

c.

meat

b.

fertilizer

d.

medicine

 

 

____         13.                Bacteria are used in ____.

a.

farming

c.

the food industry

b.

the medical industry

d.

all of the above

 

 

____         14.                The name streptococcus tells you that the bacteria are ____.

a.

pairs of spirals

c.

groups of spirals

b.

sphere shaped

d.

chains of rods

 

 

____         15.                Every year about ____ percent of all wastes produced by industry, agriculture, and cities are treated by bioremediation.

a.

2

c.

25

b.

5 to 10

d.

25 to 30

 

 

____         16.      One type of bioremediation uses ____ to break down wastes and pollutants into simple harmless compounds

a.

bacteria

c.

pasteurization

b.

vaccines

d.

fission

 

 

Matching

 

Match each statement with the correct item below.

a.

pathogens

f.

fission

b.

endospores

g.

antibiotic

c.

cocci

h.

toxins

d.

flagella

i.

spirilla

e.

bacteria

j.

bacilli

 

 

____         17.                thick-walled structures around bacteria

 

____         18.                spiral-shaped bacteria

 

____         19.                bacterial method of reproduction

 

____         20.                rod-shaped bacteria

 

____         21.                whiplike tails that move bacteria

 

____         22.                sphere-shaped bacteria

 

____         23.                produced by one organism, but inhibits or kills other organisms

 

____         24.                poisons produced by pathogens

 

____         25.                one-celled organisms without membrane-bound organelles

 

____         26.                organisms that produce disease

 

Match each statement with the correct item below.

a.

pathogen

d.

aerobes

b.

vaccine

e.

anaerobes

c.

nitrogen-fixing bacteria

f.

saprophyte

 

 

____         27.                organisms that use oxygen for respiration

 

____         28.                change nitrogen from the air into forms that can be used by plants and animals

 

____         29.                organisms that can live without oxygen

 

____         30.                organism that uses dead material as a food and energy source

 

____         31.                solution made from dead or damaged bacteria that is used to prevent bacterial diseases

 

____         32.                an organism that produces disease

 

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