Which of the following is caused by nicotine in cigarette smoke?
A) constriction of blood vessels B) faster heart rate
C) increased stickiness of platelets D) Nicotine causes all of the above.
Answer: D
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The duplication of homeotic (Hox) genes has been significant in the evolution of animals because it _____
A) permitted the evolution of novel forms B) caused the extinction of major groups C) reduced morphological diversity into simpler forms of life D) allowed animals to survive on significantly fewer calories
The number 6 carbon of mannose is exposed:
a. In the nucleus b. In the rough endoplasmic reticulum c. In the smooth endoplasmic reticulum d. In the medial phase of the Golgi e. None of the above
What causes the "leaf drop" that occurs in woody plants in preparation for winter dormancy?
A) Inhibition of gibberellin B) Suppressed auxin production C) Increased chlorophyll development D) Opened stomata E) Increased ethylene production
Suppose male drones were only half as costly to produce as female honeybees. What sex ratio would be opti-mal from the perspective of worker bees?
a. a 3:1 female:male sex ratio c. a 1:2 female: male sex ratio b. a 3:2 female:male sex ratio d. a 1:6 female:male sex ratio