A biological response to changes in the length of darkness or light in a circadian rhythm is known as ________
a. thigmotropism
b. photosynthesis
c. photoperiodism
d. phototropism
c
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Pathogen virulence NEVER changes throughout a host's life
Indicate whether the statement is true or false.
Some bacteria exhibit a primitive form of behavior in that they can sense the properties of their environments and use that ability to make adaptive responses. Which of the following are NOT capabilities of any known bacterium?
A. orientation with respect to the Earth's magnetic field B. move to other bacteria and aggregate with them in response to chemical signals C. find nutrients by moving upward in the water column with the aid of flotation devices D. respond to other individual bacteria and transmit DNA via conjugation E. none of the other options presented
Which of the following is not a standard therapy for cancer treatment?
A. surgery B. radiation therapy C. chemotherapy D. immunotherapy E. all of these are standard therapies for the treatment of cancer
The __________ insulates and protect the axon for some neurons:
a. axon terminal b. myelin sheath c. cell body d. nucleus