A lack of a functional TP53 gene __________.
a) causes a cell carrying damaged DNA to be destroyed
b) causes a cell carrying damaged DNA to fail to be destroyed
c) will allow genetically unstable cells to continue to divide
d) will stop genetically unstable cells from dividing
Ans:
b) causes a cell carrying damaged DNA to fail to be destroyed
c) will allow genetically unstable cells to continue to divide
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Why does blood flow through capillaries at a much slower rate than through the aorta?
a. Capillaries are much narrower than the aorta and provide much more friction which reduces flow to nearly zero. b. Blood flow through capillaries is reduced dramatically due to the effect of gravity on individual red blood cells. c. The combined diameter of all capillaries is larger than the aorta, which results in a commensurate reduction in flow velocity. d. Blood flowing through capillaries is deoxygenated, providing less energy for precapillary sphincters to pump blood.
The outer layer of skin is mostly ____
epithelium. a. simple squamous b. simple cuboidal c. stratified squamous d. simple columnar e. stratified cuboidal
When stored fat is used for energy, what happens to adipose cells in the body?
A) They grow larger. B) They become smaller. C) They multiply. D) They are converted into fibroblasts.
You work for a company that manufactures food products. A new "wonder food" is being distributed by a rival company. The researchers in your company determine that the "wonder food" contains only carbon, oxygen, and hydrogen. At this point, your
researchers can say with certainty that the food A) includes proteins. B) could only be made of triglycerides. C) could only be made of carbohydrates. D) does not include proteins or nucleic acids.