Which of the following cells are diploid?
a. spermatids
b. primary spermatocytes
c. secondary spermatocytes
d. spermatogonia
e. both primary spermatocytes and spermatogonia
Answer: e
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Which of the following is most true of a viral DNA genome?
A. It is usually composed of unusual bases unique to viruses. B. It uses the same four nitrogenous bases found in prokaryotic and eukaryotic DNA. C. It may have the normal bases found in prokaryotic and eukaryotic DNA, or it may have one or more unusual bases. D. Viruses do not use DNA for their genome.
What is the difference between a primary and secondary cell wall in plants?
What will be an ideal response?
What are the three basic steps of conventional PCR?
A. Denature, anneal, & strand displacement B. Reverse-transcription, anneal & extend C. Strand displacement, synthesis & release D. Denature, anneal & extension
All of the following comprise the second line of defense except ________.
A. inflammation B. fever C. complement proteins D. antibody production E. phagocytosis