Active transport:
A) causes the production of ATP within the cell.
B) increases the concentration of solute inside the cell.
C) moves substances against their concentration gradient.
D) moves only large molecules into the cell.
Answer: C
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Which of the following could explain how some (although rare) people can have Down syndrome and have a normal chromosome number?
A. One of the cells during development had trisomy 21 but then died. B. A large enough fragment of chromosome number 21 underwent a duplication event. C. A large enough fragment of chromosome number 21 underwent a deletion. D. Some of the genes in one chromosome number 21 are mutated. E. None of the answer options explains this observation.
Ammonia, a nitrogen containing-waste compound found in the blood is a waste product of ____ breakdown
a. carbohydrate b. protein c. lipid d. mineral e. vitamin
Rods and cones are located in the
a. lens. b. cornea. c. pupil. d. iris. e. retina.
In the cell cycle, controlled degradation of regulatory proteins occurs via the
A) P450-protease pathway. B) cyclin-Cdk pathway. C) ubiquitin-proteasome pathway. D) kinase inhibition pathway. E) PI3K-Akt pathway.