At which gestational week is the developing human designated a fetus?
a. 4
b. 8
c. 12
d. 16
e. 20
ANSWER: b
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Ribozymes are ________.
A. catalysts for DNA splicing B. catalysts for RNA splicing C. unique to eukaryotes D. ribosomes which catalyze reactions E. unique to prokaryotes
Which of the following is not a characteristic of normal cells?
A. They grow as a monolayer. B. They grow as multiple layers. C. They undergo a limited number of divisions and then die. D. They stick tightly to the surface of glass culture dishes.
In the "photo" reaction of photosynthesis, where does the energy to build ATP come from, exactly?
a. In the water-splitting photosystem, the electrons donated by water are converted directly into energy. b. In the NADPH-producing photosystem, the electrons from the electron transport chain produce energy upon being transferred. c. In the first electron transport chain, hydrogen ions are pumped into the thylakoid by high-energy electrons; the kinetic energy from the release of these ions builds ATP. d. In the water-splitting photosystem, the electrons release energy upon being transferred to the electron transport chain. e. The energy to build ATP does not come from any one point, exactly.
Virions attach to a target host cell by means of (capsules/capsids/ligands)
What will be an ideal response?