What is the type of speciation that can occur in an instant with a change in chromosome number?
A. Temporal
B. Mechanical
C. Behavioral
D. Ecological
E. Sympatric
Answer: E
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Which of the following is TRUE of melanosomes?
a. All people have about the same number of melanosomes. b. The color of the melanosome dictates skin color. c. Excess sunlight decreases melanin. d. White Europeans lack melanosomes. e. All of these are true.
Which of the following is true of both positive and negative gene regulation?
a. They directly reduce the rate of transcription of certain genes. b. They involve transcription factors (or RNA) binding to DNA. c. They involve transcription of all genes in the genome. d. They are not both active in the same organism or virus. e. They act away from the promoter.
Figure 13.6
Using the accompanying illustration and the assumption that half of a plant's sperm and eggs are p and half are P, one can predict that the chance of sperm p meeting egg P at fertilization is ____.
A. 50% B. 75% C. 25% D. ½ X ¼ E. 100-%
How do cells capture the energy released by cellular respiration?
A) They produce ATP. B) They produce glucose. C) They store energy in molecules of carbon dioxide. D) The energy is coupled to oxygen.