What is the composition of peptidoglycan?
a. amino acids
b. monomeric sugar compounds
c. N-acetylglucosamine and N-acetylmuramic acid
d. N-acetylglucosamine, N-acetylmuramic acid, and a few amino acids
Answer: D
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Which of the following correctly indicates the complementary base pairing of adenine in DNA and RNA?
A. adenine with thymine in both DNA and RNA B. adenine with uracil in DNA and with thymine in DNA C. adenine with thymine in DNA and with uracil in RNA D. adenine with cytosine in DNA and with guanine in RNA E. adenine with guanine in DNA and with cytosine in RNA
Which of the following types of microscopes would be most appropriate for viewing the anatomy of a whole organism?
a. light microscope b. dissecting microscope c. scanning electron microscope d. transmission electron microscope
Spawning is when fish release their
A) sperm and eggs B) gametes C) excretions D) waste matter
Lichens are symbiotic associations that __________.
a. are found in the tissues of plants and may protect them from pathogens or herbivores b. involve a fungus and a green algae or cyanobacterium c. require moist environments to grow d. fix nitrogen for absorption by plant roots e. enabled plants to move onto land