At which gestational week is the developing human designated a fetus?

a. 4
b. 8
c. 12
d. 16
e. 20


ANSWER: b

Biology & Microbiology

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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

Biology & Microbiology

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.

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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.

Biology & Microbiology

Virions attach to a target host cell by means of (capsules/capsids/ligands)

What will be an ideal response?

Biology & Microbiology