Turgor pressure is observed when a plant cells environment is ________.
A. hyperosmotic
B. hypoosmotic
C. isosmotic
D. osmosis
Answer: B
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Matt is studying how the protein transferrin enters cells. He examines cells that have taken up transferrin, and finds clathrin-coated vesicles. What mechanism was used to take transferrin into the cell?
A. Phagocytosis B. Pinocytosis C. Exocytosis D. Receptor-mediator endocytosis
Rett syndrome results from
A) a microRNA that binds the wrong set of mRNA targets. B) unstable transposons. C) fetal hemoglobin that is reactivated in a child. D) abnormal methylation of a gene expressed in the brain.
Which pattern of diploid and haploid phases reflect the life cycle in plants?
a. alternation between haploid and diploid generations b. two haploid generations followed by a diploid generation c. one haploid generation followed by two diploid generations d. a single generation that limits the haploid state to gametes while the rest of the organism is diploid e. a single generation that limits the diploid state to gametes while the rest of the organism is haploid
All of the following are used to protect organisms from the toxic by-products of oxygen EXCEPT
A) carotenoids. B) superoxide dismutase. C) peroxidase. D) protease. E) catalase.