Bacterial cell walls that are resistant to drying contain
A. carbohydrates.
B. amino acids.
C. lipopolysaccharide.
D. tubulin.
E. waxes.
Answer: E
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Crossing over occurs during which step in meiosis?
A. prophase 1 B. anaphase 1 C. prophase 2 D. metaphase 1
Which of the following is not a characteristic feature of chordates during development?
A. notochord B. neural tube C. myotomes D. All of these are seen during development.
The genetic information in viruses
A. is always DNA. B. is always RNA. C. is found in the nucleus of the virus. D. can be replicated outside of a cell. E. is either DNA or RNA.
The first animals to show cephalization have several characteristics. Which of the following is NOT one of them?
a. These animals were triploblastic. b. These animals had a proboscis. c. These animals were in phylum Platyhelminthes. d. These animals are placed in the group Lophotrochozoa. e. These animals followed the protostome pattern of embryonic development