Which of the following mutagens causes mutations by creating thymine dimers?
a. nucleotide analogs
b. nitrous acid
c. ultraviolet light
d. benzopyrene
e. gamma rays

Which codon is the code for the amino acid histidine (his)?

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

Which of these has happened to your food by the time it reaches your small intestine? a. all the macromolecules have been broken down completely. b. lipids and starches have been partially broken down. c. starches and proteins have been partially broken down. d. proteins and lipids have been broken down into subunits.