The figure shows a simplified phylogeny of closely related species of primates. This tree was proposed by comparing DNA sequence changes in the gene for cytochrome oxidase subunit II. The vertical scale represents time and the branch points represent common ancestors. What species did ancestor B give rise to?
A. All of the species except siamangs.
B. Siamangs and orangutans.
C. All of the species except siamangs and pigmy chimps.
D. All of the species except orangutans.
E. Gorillas, humans, and both types of chimps.
Answer: A
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If a human has the genotype XXXY, they would have:
A. 3 inactivated X chromosomes and be male. B. 2 inactivated X chromosomes and be male. C. 3 inactivated X chromosomes and be female. D. 2 inactivated X chromosomes and be female. E. 1 inactivated X chromosome and be male.
Monomers are removed from polymers by ________ reactions.
A) condensation B) hydrolysis C) neutralization D) substitution E) redox
Which medium can be described as containing crystal violet dye to inhibit the growth of gram-positive bacteria and fungi and allows many types of gram-negative bacilli to grow?
a. Thayer-Martin agar b. MacConkey agar c. PEA d. Hektoen enteric agar
Which of the following is NOT an example of a human activity that directly threatens the biodiversity of species?
a) the destruction of habitats b) the picking of flowers c) the introduction of invasive species d) the overexploitation of resources e) the burning of fossil fuels