Sorting of hormones into regulated secretory vesicles in the trans-Golgi network involves
A) mannose-6-phosphorylation.
B) formation of large aggregates.
C) a KDEL receptor.
D) a zymogen granule receptor.
E) O-linked glycosylation
Answer: B
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Why are changes in the global carbon cycle important?
I) Burning reduces available carbon for primary producers and, therefore, primary consumers. II) Deforestation and suburbanization reduce an area's net primary productivity. III) Increasing atmospheric concentrations of carbon dioxide could alter Earth's climate. IV) By using fossil fuels we are destroying a nonrenewable resource. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, III, and IV
Which of the following structural motifs are notcommonly found in the DNA-binding motifs of proteins that act as transcriptional regulators?
A. homeodomain B. leucine zipper C. ?-barrel D. helix-turn-helix
Situated in the center of the flower, the structure in which female gametophytes form is called the ____
a. petal b. carpel c. stamen d. anther e. sepal
Whereas animal cells drive indirect transport with a Na+ gradient, most other organisms use
A) a glucose gradient. B) light energy. C) an H+ gradient. D) a Ca2+ gradient. E) osmosis.