What do the four membranes of apicoplasts imply about the nature of the endosymbiosis event that produced them?
What will be an ideal response?
ANS:
Apicoplasts have arisen from a secondary endosymbiosis event in which they are derived from engulfing an organism that already had an endosymbiont.
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The male gametophyte of a pine tree
(a) is produced within a pollen grain. (b) produces sperm. (c) is diploid. (d) is both a and b.
Which of the following is not an example of nonhuman culture?
A. birds learning from each other how to peck through aluminum caps of milk bottles B. adult meerkats teaching their young how handle their prey C. chimpanzees using tools to catch insects D. a Japanese baby learning how to speak Japanese E. None of the answer options is correct.
Humans share several features with salamanders. Certain genes and proteins are nearly identical between the two species; both species have four limbs with a similar skeletal structure; the species' early embryos are very similar; and where the salamander has a functional tail, humans have a vestigial tailbone. In evolutionary terms, these are examples of
A) biogeographic similarity. B) homology. C) independently acquired traits. D) adaptation by natural selection. E) coincidental similarity.
Evaporation from the leaves of a tree will pull water up through the roots as an unbroken column throughout the entire height of the tree. This feat is possible because of which characteristic of water?
A) surface tension B) cohesion C) absorption D) kinetic energy E) vaporization