The human elbow is an example of which kind of joint?
a. synovial joint
b. cartilaginous joint
c. fibrous joint
d. non-fibrous joint
e. non-synovial joint
A
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As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy?
A) It excites electrons of the reaction center of photosystem I. B) It is lost as heat. C) It is used to establish and maintain a proton gradient. D) It is used to phosphorylate NAD+ to NADPH, the molecule that accepts electrons from photosystem I.
In humans and other mammals, dosage compensation is achieved by:
A. males transcribing double the normal amount of copies of X-chromosome genes. B. females decreasing transcription of both X chromosomes by ½. C. females eliminating one X chromosome in each cell. D. females inactivating the paternal X chromosome in each cell. E. females randomly inactivating one X chromosome in each cell.
________ is a drug that blocks cell division by stabilizing microtubules; as a result, it is used in the treatment of ________
A) Vincristine; listeriosis B) Vinblastine; lung cancer C) Taxol; breast cancer D) Nocodazole; athlete's foot E) Colchicine; gout
Which of the following contains the most cells?
A) tissue B) an organ C) an organ system D) an organism