You had a cold last month and you caught another one this month from your brother. Why could this
happen?
a. Memory cells were not formed as a response to the first cold.
b. The antibodies formed as a response to the first cold were degraded.
c. The two cold viruses are different.
d. Your macrophages are not working properly.
e. Your antigen-presenting cells do not recognize the second cold virus.
C
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In which of the following excretory tubule segments in mammals does about 65 percent of the water
from the filtrate get reabsorbed?
a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle
The second structure encountered in a biopsy
of the stomach is the a. mucosa. b. submucosa. c. longitudinal muscle layer. d. circular muscle layer. e. serosa.
The asteroid impact of about 65 million years ago led to the extinction of
a. sequoia trees. b. giant redwood trees. c. dinosaurs and some other life forms. d. giant squid. e. undersea creatures similar to the "Loch Ness Monster."
You have discovered a kind of bird which has adapted to become aquatic. What would you expect if it lives submerged in freshwater?
What will be an ideal response?