The above figure is a photograph of
a. a plant with root nodules.
b. mycorrhizae.
c. root hairs.
d. a demonstration of the effect of mutualistic
Rhizobium.
e. a microscopic view of a nodule forming around
area where the bacterium infect.
Answer: c
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You are trying out for the USA Olympic gymnastics team. Everything is going well until you turn your ankle on the landing and tear a connection between two bones. You probably
A. sprained a ligament. B. strained a ligament. C. sprained a tendon. D. strained a tendon. E. strained the cartilage.
Why do neurons generate an action potential, instead of simply relying on the opening of ion channels near the stimulus site to transmit information?
What will be an ideal response?
The molecule that carries the amino acid to the ribosome is
A. DNA. B. tRNA. C. mRNA. D. rRNA.
Which of the following items are typically irradiated in order to kill microbes?
A. operating room air B. surgical gloves C. human tissues such as heart valves and skin D. ground beef and other meat and poultry E. All of these choices are correct.