Laboratory simulations provide indirect evidence that organic compounds such as __________ and __________ selfassemble
spontaneously under conditions like those thought to have prevailed on the early Earth. Fill in the blank(s) with the appropriate word(s).
ANSWER: amino acids; nucleotides
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The primary function served by erythrocytes is
A. transport of oxygen. B. defense against pathogens. C. buffering against changes in blood pH. D. sealing breaks in the walls of blood vessels. E. transport of water-soluble vitamins.
What were the Ediacaran fauna?
A) organisms that seem to be the first life on Earth B) symbiotic organisms that evolved into cellular organelles C) the first multicellular organisms found in the fossil record D) the most ancient ancestors of organisms in kingdom Protista
Which of the following would be a secondary sexual characteristic?
A. testosterone produced by the testis B. the development of a menstrual cycle C. erection of the penis or clitoris D. the different amount and location of body fat in men and women
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. receptor-mediator endocytosis D. exocytosis