A fossil is defined most broadly as:
a) a piece of an organism that has turned into rock.
b) the preserved pieces of hard parts (e.g., shell or bone) of extinct animals.
c) the process of preservation of intact animal bodies.
d) any preserved remnant or trace of an organism from the past.
e) the preserved bones of vertebrates.
Ans: d) any preserved remnant or trace of an organism from the past.
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Which line of evidence supports the protein-first hypothesis?
a. Amino acids existed on prebiotic Earth and in meteorites. b. Proteins display more chemical diversity than nucleic acids. c. Proteins display more structural diversity than nucleic acids. d. Protein function can be reproduced in a population. e. Nucleic acids are too simple to have been the first "polymers of life."
Glycolysis depends on a continuous supply of:
a. oxygen b. pyruvate c. NAD+ d. NADH e. H2O
Modern oceanography and marine biology were attributed to:
a. the voyage of the Beagle. b. the discoveries of Alvin. c. the laying of the transatlantic telegraph cable. d. expeditions of Alexander Agassiz. e. the Challenger expedition.
In the biosynthetic pathway for conversion from homoserine to methionine, you identify a Neurospora crassa double mutant Met1/Met2. This mutant will grow only if which supplement(s) are added to the minimal media?
A) homoserine only B) cysteine only C) homocysteine only D) cystathionine and homocysteine E) methionine only