35. The influenza virus contains an RNA genome. Every year a flu vaccine is designed to protect against three different strains of the influenza virus. Why do scientists make a new vaccine each year?
A. The virus develops resistance to the vaccine.
B. People change their habits each year and become susceptible to different strains of the virus.
C. The virus can rapidly mutate into new strains.
D. The common influenza virus can come from many species of animals, including cats and dogs.
E. Our bodies develop resistance to the vaccine and it becomes less effective.
C. The virus can rapidly mutate into new strains.
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The cell wall is a common feature to
A. prokaryotic cells only. B. plant cells only. C. animal cells only. D. prokaryotic and plant cells. E. prokaryotic, plant, and animal cells.
Avery, MacLeod, and McCarty's experiments built on the results of the experiments of
A) Gregor Mendel. B) Frederick Griffith. C) Alfred Hershey and Martha Chase. D) Erwin Chargaff and Phoebus Levene.
Which of these muscle types permit(s) voluntary movement?
A) cardiac B) skeletal C) smooth D) All of the above permit voluntary movement.
In double fertilization, one sperm fuses with the egg, and the other sperm fuses with the two antipodal nuclei. Indicate whether the statement is true or false