Roots contain starch-heavy plastids known as
A. chloroplasts.
B. plastoplasts.
C. statoliths.
D. strongoliths.
E. chromoplasts.
Answer: C
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The most commonly used unit for measuring cell size is a ____
a. decimeter (dm) b. centimeter (cm) c. millimeter (mm) d. micrometer (?m) e. nanometer (nm)
An animal with bilateral symmetry:
a. has no defined body sides b. usually has no body cavity c. has body parts repeated around a central axis d. has left and right sides and usually displays cephalization e. is not typical of animals with a three-layer body plan
The accompanying figure shows the percentage of pairwise genetic comparisons within sample populations of living hominids, graphed against the percentage of sequence divergence for each pair. We can conclude from the figure that ________
A) any randomly selected pair of humans in the world should differ in their mitochondrial DNA sequences by less than 6% B) humans are more genetically diverse than Western chimpanzees C) hominid species do not differ significantly in levels of genetic diversity D) humans share a more recent common ancestor with bonobos than gorillas E) All of the above.
Which one of the following activities would be facilitated by the sympathetic nervous system?
A) increased digestion and absorption B) decreased respiratory rate C) increased blood pressure D) decreased heart rate E) increased bladder contraction