Silica-rich shells of ancient diatoms are the source of diatomaceous earth that can be used _____
a. to thicken foods c. as a fertilizer
b. as a gelatin substitute d. as an insecticide
D
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Natasha has schizophrenia. The probability that her young brother Boris develops schizophrenia too is about ________ times the general worldwide population risk.
A) 2 B) 4 C) 9 D) 12
Four of the following statements are true of predator-prey coevolution. Which one is FALSE?
a. Each species exerts selection pressure on the other. b. Predators are selective agents that favor improved prey defenses. c. Prey with better defenses are selective agents that favor better predator hunting skills. d. Coevolution only occurs in animals and is usually seen after one reproductive generation. e. Camouflage, warning coloration, and mimicry are all examples of coevolution tactics.
No exceptions to the central dogma exist. RNA is always transcribed from DNA, and RNA is translated to produce proteins.
a. true b. false
During transcription, uracil pairs with _____________.
A. ribose B. adenine C. cytosine D. thymine E. guanine