In humans and in chimpanzees, 99% of the Alu retrotransposons are in corresponding positions. Which of the following statements below is the most likely explanation for this similarity?
(a) The Alu retrotransposon is not capable of transposition in humans.
(b) Most of the Alu sequences in the chimpanzee genome underwent duplication and divergence before humans and chimpanzees diverged.
(c) The Alu retrotransposons are in the most beneficial position in the genome for primates.
(d) The Alu retrotransposons must also be in the same position in flies.
(b)
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The White Cliffs of Dover, England, are composed of shells of ancient diatoms
Indicate whether the statement is true or false.
The carbon source for organisms that derive their
energy from photosynthesis is a. the soil. b. carbon dioxide. c. any hydrocarbon. d. methane. e. glucose.
Which of the following is not characteristic of primates?
a. stereoscopic vision b. grasping hands c. large brain size d. freely rotating limbs e. claws at the tips of digits
The active, feeding form of a(n) ________ is a thin, multinucleate plasmodium
Fill in the blank(s) with correct word