Which of the following events must occur to cause a chromosomal translocation?
A. One chromosome must break in two distinct locations.
B. Two different chromosomes must break.
C. A transposon must be present in one of the chromosomes.
D. The broken ends must pair correctly.
E. A mutation in the DNA must occur.
B. Two different chromosomes must break.
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The diapsids diverged into the lepidosaurs and the archosaurs. From which of these groups did the snakes arise?
a. archosaurs b. neither of these groups c. lepidosaurs d. There are species of snakes from both of these groups.
When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to
A. more possible products of the reaction B. more permanent binding through intimate total contact C. a greater supply of activation energy D. a great range of possible catalytic activities E. an induced fit
The type of cleavage seen in deuterostomes is called ________ cleavage.
Fill in the blank(s) with the appropriate word(s).
Chlorosis in plants is a condition best explained by
A. lack of oxygen. B. lack of soil moisture. C. lack of water. D. lack of carbon dioxide. E. lack of certain minerals.