A breeder of thoroughbreds selects only the fastest horses for breeding stock. This is an example of artificial _____
a) directional
b) disruptive
c) frequency-dependent
d) sexual
e) stabilizing
Answer: a) directional
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Carbon dioxide is the most abundant greenhouse gas in the atmosphere. What is its current concentration?
A. 1.5 ppm B. 1.75 ppm C. 385 ppm D. 560 ppm E. 700 ppm
Which of the following statements concerning PCR is false?
a. PCR can only be carried out if DNA polymerase is heat-resistant. b. PCR is used to amplify tiny quantities of DNA in vitro. c. PCR replicates specific DNA sequences. d. PCR has applications for archaeology and crime scene analysis. e. PCR utilizes a heat-sensitive Taq polymerase.
In flowering plants the small male gametophyte plants are known as
A. spores. B. stamens. C. seeds. D. pollen.
Polymers of polysaccharides, fats, and proteins are all synthesized from monomers by
A) connecting monosaccharides together. B) the formation of disulfide bridges between monomers. C) ionic bonding of the monomers. D) the addition of water to each monomer. E) the removal of water