The primary function of spongy mesophyll is:
a. photosynthesis.
b. transpiration.
c. to allow diffusion of gases.
d. transport of substances.
e. transport of water.
C
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The master gene Hox helps to sculpt the body plan of
embryos by a. inhibiting the Dlx gene to prevent extra limbs. b. timing the activation of Dlx genes. c. causing cell death in any cell not expressing the Hox gene. d. converting sugar into energy to allow the process to go to completion. e. inducing mutations in plants.
You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered snapdragon. All of the F1 are pink. What can you say about the alleles for the parental traits?
A. Both red and white are recessive. B. Red and white show incomplete dominance. C. Pink is dominant, whereas red and white are recessive. D. Red is dominant.
Which of the following correctly describes how protein kinase A can activate genes?
a. Nuclear protein kinase A is activated by cAMP to phosphorylate general transcription factors. b. Cytosolic protein kinase A is activated by cAMP to release the catalytic subunits, which move into the nucleus and phosphorylate CREB. c. Cytosolic protein kinase A is activated by cAMP to release the catalytic subunits, which move into the nucleus and phosphorylate general transcription factors. d. Nuclear protein kinase A is activated by cAMP to phosphorylate CREB.
Fertilization in the female reproductive tract typically occurs in the
A) ovary. B) oviduct. C) uterus.