Which numbered item in the figure above represents a female gametophyte?
a. 1
b. 2
c. 3
d. 4
e. 5
ANSWER: b
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Which of the following statements about mRNAs and microRNAs is false?
A. Both are transcribed by RNA Pol II. B. Both are capped and polyadenylated. C. Both undergo nucleolytic cleavage in the nucleus and the cytoplasm. D. Both are processed via interaction with snoRNPs.
Photosynthesis and cellular respiration are both complementary and relatively balanced, but early history of life on Earth showed increasing oxygen concentrations. This indicates that
a. both photosynthesis and respiration were occurring at approximately the same levels. b. neither photosynthesis nor respiration were occurring. c. the amount of photosynthesis occurring exceeded the amount of cellular respiration. d. the amount of cellular respiration occurring exceeded the amount of photosynthesis.
If the sequence of bases in mRNA is U, C, A, the sequence of bases in DNA is
A. A, G, and U. B. A, G, and T. C. A, C, and A. D. T, G, and U.
We sometimes are able to generate antibodies (immune system proteins) that bind to and cover up some of the proteins on the outermost portion of a virus while it is in the bloodstream. This renders the virus unable to reproduce. Which step of viral replication are antibodies directly preventing?
a. assembly b. uncoating c. synthesis d. attachment