Most octopuses die early in life; those that
survive can live up to 5 years. Octopuses are
best characterized by a type __ survivorship
curve.
a. I
b. II
c. III
d. more than one of these
e. none of these
C
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Which of the following represents microbial control by osmotic pressure?
A. Placing fruit slices on a drying rack B. The crew of the Mayflower using salted meats throughout their voyage to the New World C. Pickling cucumbers and other vegetables for long-term storage D. Canning tomatoes after a summer growing season to use throughout the winter
Barr bodies
A. are formed only in males and inactivate Xic on autosomes. B. cause an increased production of X-linked gene products. C. inactivate Xic on autosomes. D. are formed only in males. E. are formed in females.
Which of the following contributes to the extensive variability of immunoglobin genes?
A. The genes for the light-chain variable regions undergo rearrangement in germ-line cells. B. RNA transcripts from the recombinant genes undergo splicing that further changes the combinations in the final protein chains. C. The light chains generated by rearrangement and splicing can combine with the numerous heavy chains that have also undergone rearrangement and splicing. This results in even more variability in the final assembled antibody. D. The genes for the heavy-chain variable regions undergo rearrangement in germ-line cells. E. All of the choices given are correct.
When a species dies, the species is said to be:
a. extinct. b. extant. c. endangered. d. threatened. e. endemic