Carbon is stored in what form?
a. land biomass
b. sediments
c. rocks
d. the ocean
e. all of these
E
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Of the 64 triplet combinations in the genetic code, ____________________ code(s) for amino acids and ____________________ code(s) for the signal that ends protein synthesis
Fill in the blank(s) with correct word
Which pairing is incorrect?
A. A:T B. G:C C. A:U D. A:G
Which of the following statements is TRUE?
a. Hormones produce effects only in cells with the correct receptors. b. Hormones are limited to steroid compounds. c. Hormones are secreted by specialized exocrine glands. d. Most hormones are controlled by positive feedback mechanisms involving the pituitary gland. e. Hormones are electrochemical events
The oldest fossils are those of tiny bacteria, which are classified as prokaryotes. Why are these organisms classified as prokaryotes?
A) They are single-celled organisms that lack internal membrane-bound compartments. B) They consist of cells that lack any genetic information. C) They are the first organisms that appeared on Earth. D) They are single-celled organisms that no longer exist on Earth.