The influenza virus contains an RNA genome. Why do scientists typically have to make a new vaccine for the flu every year?
A. because our bodies develop resistance to the vaccine and it becomes less effective
B. because the virus develops resistance to the vaccine
C. because the virus can mutate into new strains
D. because people change their habits each year and become susceptible to different strains of the virus
E. because the common influenza virus can come from many species of animals including cats and dogs
Ans: C. because the virus can mutate into new strains
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The main purpose of fermentation reactions is to
a. produce ATP. b. regenerate the electron carriers needed for glycolysis. c. produce the building blocks for biological molecules. d. prepare the pyruvate for the Krebs cycle. e. provide various products useful for man.
The increase in interstitial hydrostatic pressure associated with an edema will lead to a(n)
A) decrease in the recruitment of leukocytes to the site of infection. B) sensation of pain. C) release of bradykinin. D) increase in blood flow. E) increased movement of water out of the capillaries.
Why does DNA synthesis proceed in a 5? to 3? direction?
a. DNA polymerases can only add nucleotides to the 3? end of a polynucleotide strand. b. The 3? end of the polynucleotide molecule contains more phosphates than the 5? end. c. DNA unzips in the 5’ to 3’ direction. d. DNA strands are parallel to each other. e. Chromosomes are aligned in the 5? to 3? direction in the nucleus.
The fever and chills associated with malaria are due to the release of uninucleate daughter cells of Plasmodium called (gametocytes/schizonts/coencytes)
What will be an ideal response?