Four of the following are characteristics of a species. Which one is the exception?
A. They exist in one or more populations.
B. They produce fertile offspring.
C. They are reproductively isolated from other groups.
D. They are identical in appearance.
E. They interbreed.
Answer: D
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The DNA sequence ATGCATGC will pair with which of the following DNA strands?
TACGTACG TACCTACC ATGCATGC TTGCATCC CGTACGTA
Changes in tool-kit gene expression (i.e. Hox genes) has been important in what events?
A. The diversification of body plans in arthropods. B. The development of the vertebrate jaw. C. The diversification of mollusk body plans. D. All of the above.
Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________.
A) alanine; is a simple methyl group B) glycine; is a hydrogen atom C) glycine; is unbranched D) lysine; contains only nitrogen E) proline; forms a covalent bond with the amino group
How are prions different from all other known infectious agents?
A) They cannot reproduce outside a cell. B) They act as slow viruses. C) They cause neurological problems. D) They can be destroyed by incineration. E) They lack nucleic acid.