Which of the following respiratory systems is not dependent on the animal's circulatory system to function efficiently?
A. vertebrate lungs
B. fish gills
C. tracheal systems in insects
D. the skin of earthworms
E. All of the systems noted here are closely associated with the circulatory system.
C. tracheal systems in insects
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Draw a graph of relative fitness and number of mutations of an evolving strain versus the ancestral strain over 20,000 generations under the same growth conditions
Explain the change in fitness and mutations over time using evolutionary concepts and terms. What will be an ideal response?
The enzyme ____ produces ____ DNA that is complementary to mRNA
a. reverse transcriptase; single-stranded b. reverse transcriptase; double-stranded c. DNA polymerase; single-stranded d. DNA polymerase; double-stranded e. RNA polymerase; single-stranded
There is some evidence that reptiles called cynodonts may have had whisker-like hairs around their mouths. If true, then hair is a shared _____
A) derived character of mammals, even if cynodonts continue to be classified as reptiles B) derived character of the amniote clade and not of the mammal clade C) ancestral character of the amniote clade, but only if cynodonts are reclassified as mammals D) derived character of mammals, but only if cynodonts are reclassified as mammals
What is unique about the Hepadnaviridae family of viruses?
A) They contain RNA. B) They contain double-stranded RNA. C) They contain single-stranded DNA. D) They contain double-stranded DNA. E) They contain both single-stranded DNA and double-stranded DNA.