Which of the following are synonymous codons?
A) UUC and UUG
B) UCC and UAC
C) CGA and AGA
D) AGG and AGC
E) AAG and AAC
C
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In his voyage around the world in the Beagle,
what observation did Darwin make about animals?
a. animals in similar climate zones were similar regardless of where they lived b. animals isolated on islands were unlike any living on nearby mainlands c. animals living closer together appeared more closely related to each other than animals living further away d. fossils of animals he found were unlike any animals still living e. there appeared to be no genetic connections between any of the animals he observed
What can be said about sex-determination in humans?
a. All human sperm carry a Y chromosome. b. 25% of human zygotes are XY. c. All zygotes carry a Y chromosome. d. Sex depends upon which type of sperm fertilizes the egg. e. All human eggs carry a Y chromosome.
What type of soil contains the highest amount of oxygen?
A) sand B) clay C) silt D) gravel
The production of NADH takes place during the ________ stage(s) of glycolysis
A) energy-conservation B) energy-investment C) lysis D) lysis and energy-investment E) energy-investment and energy-conservation