Science Exam Chapter 7 :D
What happens when a virus enters a host cell ?
it is sometimes active and sometimes latent
_______ immunity develops when a mother passes antibodies on to her unborn baby
natural
Peanuts and peas contain nitrogen-fixing bacteria in growths on roots called _____
nodules
What is the purpose of the capsules on bacteria ?
protects bacterium from drying out
Which process can viruses undergo ?
replicate themselves
Which of the following is NOT a method to prevent the spread of viral diseases ?
share cups with a sick person
A virus attaches to a host cell. What is the next process in the replication cycle ?
the virus inserts its genetic material or DNA into the host cell
Which of the following is a means for bacteria to enter your body ?
through the food you eat, through a cut, in the air you breathe
Viral diseases are dfficult to treat for which reason ?
viruses are constantly changing or mutating DNA
Viruses can infect all of the following except ____
water
There are approximately how many known species of bacteria ?
5,000
Which components does a virus have ?
DNA or RNA
Which of the following does NOT protect you from viruses ?
antibiotics
Which element can some plants obtain from bacteria ?
nitrogen
Which of the following do viruses need to carry on functions ?
organisms
Which of the following is NOT a shape common to viruses ?
square
Bacteria that live in places with a supply of oxygen are called ?
aerobic bacteria
What does the flagellum of a bacteria do ?
allow the bacteria to move
Vaccines trigger the production of ____
antibodies
Bacteria are used to make all the following foods except ___
apples
An antibiotic is a drug used to kill ______
bacteria
One type of bioremedition uses ____ to break down wastes and pollutants into less harmful material
bacteria
What do bacteria do in a cow's stomach ?
break down cellulose in plants
Helpful bacteria can do all of the following except ______
cause food poisoning
Viruses attack and destroy which of the following ?
cells
Bacteria are responsible for all the followng in humans except _____
digesting uranium
Thick walls produced by some bacteria pathogens are called _____
endospores
Bacteria are found ____
everywhere on earth
Which of the following is NOT a food that is usually pasteurized ?
fresh fruit
Which of the following is NOT a method used by bacteria to obtain food ?
grow and harvest their own food
Harmful bacteria in food can be killed by _____
heat
What is the purpose of the pili on the surface of bacteria ?
help bacteria stick to surfaces
Of the following, where are archea likely to be found ?
hot springs
