Suppose that your parents are both heterozygous for sickle cell disease. What is the probability that you will have the disorder?
a. 25%, whether or not you have siblings
b. 50%, whether or not you have siblings
c. 75%, whether or not you have siblings
d. 100%, whether or not you have siblings
Answer: a. 25%, whether or not you have siblings
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Which one of the following incorrectly pairs a vertebrate group with its major evolutionary innovation?
A. Amphibians—paired lateral fins B. Dinosaurs—bipedalism C. Placoderms—jaws D. Sharks—teeth E. Ostracoderms—cartilaginous endoskeleton
Ice floats in liquid water because
a. ice forms hydrogen bonds with the surface of liquid water. b. ice forms hydrogen bonds but liquid water does not. c. the hydrogen bonds of liquid water are fixed in place. d. liquid water forms hydrogen bonds but ice does not. e. the distance between water molecules is maximized due to the hydrogen bonds which are fixed in place.
The net primary productivity is the amount of energy
A. trapped by the autotrophs of an ecosystem. B. given off as heat by producers. C. available for consumers. D. used in metabolism by producers. E. Both given off as heat by producers and trapped by the autotrophs of an ecosystem are correct.
Which of the following statements BEST summarizes structural differences between DNA and RNA?
A. RNA is a protein, while DNA is a nucleic acid. B. RNA is a polymer, but DNA is not. C. DNA contains a different sugar than RNA. D. RNA is a double helix, but DNA is not. E. All the bases in DNA differ from those in RNA.