The DO represents the _____ dose for human cells.
a) mean survival
b) mean lethal
c) 50% survival
d) 50% lethal
Ans: b) mean lethal
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You are out at night and hear a sound in the bushes. The electrical signal carrying this information to your brain is carried first by a
A. sensory neuron. B. motor neuron. C. interneuron. D. glial cell. E. All of these choices are correct.
Which of the following is an incorrect match?
a. pea pods; dehiscent b. strawberry; berry c. cherry; drupe d. corn; indehiscent e. tomato; berry
Chemical evolution started on Earth
a. after the appearance of prokaryotic cells. b. long before any cells emerged. c. after the appearance of eukaryotic cells. d. after the appearance of eukaryotic cells but before the appearance of multicellular organisms. e. after the appearance of multicellular organisms.
Which statement regarding genetics is false?
A) In keeping with our greater complexity, the human genome has about 100 times more genes than that of yeast. B) Despite morphological similarities, fungi are more closely related to animals than they are to plants. C) About 99% of the genes of humans and mice are related by descent from a common ancestor. D) The more recently two species have branched from a common ancestor, the more similar we expect their DNA sequences to be.