a. carbon dioxide and water
b. oxygen and water
c. carbon dioxide and sugars
d. oxygen and sugars
100
Which of the following is found in the cytoplasm of bacterial cells?
a. cell membrane
b. nucleus
c. genetic material
d. flagella
100
The shape of the ____________________ on a virus’s coat allows the virus to attach to certain cells.
a. protein
b. head
c. genetic material
d. none of the above
100
Which shape describes some bacterial cells?
a. cube-shaped
b. bullet-shaped
c. spiral
d. robotlike
100
Which term refers to the diffusion of water molecules through a selectively permeable membrane?
a. osmosis
b. engulfing
c. active transport
d. passive transport
200
What happens during photosynthesis?
a. The cell uses oxygen to make food.
b. The cell uses the energy in sunlight to make food.
c. The cell uses glucose to make oxygen.
d. The cell uses the energy in sunlight to make carbon dioxide.
200
Which of the following structures are always found in bacterial cells?
a. nuclei
b. ribosomes
c. flagella
d. coats
200
A virus’s _________________________ contains the instructions for making new viruses.
a. protein coat
b. nucleus
c. head
d. genetic material
200
Which of the following is NOT a role of bacteria that live in human bodies?
a. digesting food
b. competing for space with disease-causing bacteria
c. making vitamins
d. fixing nitrogen
200
Which term refers to the movement of molecules from an area of higher concentration to an area of lower concentration?
a. collision
b. diffusion
c. active transport
d. concentration
300
How does photosynthesis benefit heterotrophs
a. It adds carbon dioxide to the air.
b. It creates food that they can eat.
c. It eliminates harmful sugars.
d. It creates clean water.
300
Chloroplasts contain a pigment called ____________________ that captures the energy in light.
a. cytoplasm
b. chlorophyll
c. clostridium
d. DNA
300
A hidden virus
a. cannot attach to a host cell.
b. becomes part of the host cell’s genetic material.
c. immediately takes over the cell’s functions.
d. attaches to but does not enter the cell.
300
Binary fission is the bacterial process of
a. asexual reproduction.
b. obtaining food.
c. producing energy.
d. forming endospores.
300
What directly provides energy for a virus?
a. food
b. its host
c. the sun
d. a parasite
400
How are photosynthesis and respiration related?
a. They have opposite equations.
b. They have the same equation.
c. They both produce carbon dioxide.
d. They both produce oxygen.
400
Which of the following is an example of symbiotic mutualism?
a. two paramecia exchanging genetic material
b. the zooflagellate Giardia reproducing in a human
c. the sporozoan Plasmodium feeding on a human cell
d. a zooflagellate digesting food in a termite’s intestine
400
Viruses are considered to be nonliving because they
a. cannot multiply.
b. use energy to grow.
c. are smaller than bacteria.
d. do not show all the characteristics of life.
400
Endospores form during
a. binary fission.
b. sunlight hours.
c. respiration.
d. harsh environmental conditions.
400
How does a vaccine work?
a. It activates the body’s natural defenses.
b. It weakens the cell walls of bacteria, causing the cells to burst.
c. It treats the symptoms of an infection.
d. It attacks antibiotic-resistant bacteria.
500
Together, respiration and photosynthesis keep the levels of carbon dioxide and oxygen in the atmosphere
a. fairly constant.
b. constantly changing.
c. constantly increasing.
d. constantly decreasing.
500
Some bacteria move by using a long, whiplike structure called a(an) ____________________.
a. cilia
b. tail
c. flagella
d. mitochondria
500
Why are viruses like parasites?
a. They harm the cells they enter.
b. They multiply.
c. They use their own energy to develop.
d. They make their own food.
500
What process results in genetically different bacteria?
a. binary fission
b. respiration
c. conjugation
d. asexual reproduction
500
Small openings called ____________________ allow carbon dioxide to enter a leaf.
a. spores
b. stomata
c. osmosis
d. none of the above