Which process is NOT associated with structures that are formed from the extensive infolding of eukaryotic membranes?
A. Concentration of nutrients
B. Cell division
C. Transport of proteins
D. Protection of metabolic machinery
E. Greater surface area for metabolism
Answer: B
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There is a controversy over pre-teen girls receiving the HPV vaccine. Many parents think that giving this vaccine condones sexual activity at a young age. On the other hand, there are parents who do not want their kids to pick up STIs. Why is the vaccine recommended for 11-12 year old girls? Why not give the vaccine to young adult women who are just becoming sexually active?
A. Very young women tend to get cancer from HPV, whereas women who are older get warts from HPV. B. The immune system is strongest in pre-teen girls, so it is best to give the vaccine very early in life. C. Once the young woman becomes infected with HPV, the virus gets into cells. It is then too late to vaccinate. D. The vaccine is cheaper for young girls since the dosage of virus in the vaccine is far less than that given for older women.
Enzyme activity may be affected by
a. temperature. b. the presence of chemicals that fit into allosteric sites. c. feedback inhibition. d. metabolic conditions in the cell. e. all of these.
Alcohols
A. denature proteins when in a 50-95% alcohol-water solution. B. are skin degerming agents. C. at 50% or higher concentrations dissolve cell membrane lipids. D. disinfect items when soaking method is utilized. E. All of the choices are correct.
Why are receptors on the cell surface necessary for bacterial movement?
a. The receptors actually spin the flagella. b. The receptors sense the stimulus and send signals to the flagella. c. The bacterium contains receptors that are sensitive to light. d. The receptors physically alter shape to steer the bacterium.