Seasonal abscission of fruits and leaves is mediated by ____
a. abscisic acid
b. ethylene
c. gibberellin
d. auxin
e. cytokinin
ANSWER: b
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In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that
sold expensive furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver ? silver >>> all silver offspring; (2) silver ? platinum >>> equal numbers of silver and platinum; (3) platinum ? platinum >>> two platinum for each silver offspring. Explain. What will be an ideal response?
The "father of epidemiology" is:
a. hippocrates b. edward jenner c. john snow d. john grault
Most invertebrates, such as the annelid, have nephridia.
Answer the following statement true (T) or false (F)
Which of the following statements regarding antibody function is FALSE?
A. They can prevent virus attachment to host cells. B. They can facilitate phagocyte attack on bacteria with a capsule (glycocalyx). C. They can penetrate host cells to bind intracellular antigens. D. They can facilitate cytotoxic attack by natural killer lymphocytes. E. They can bind more than one pathogen at a time, forming complexes.