Two amino acids that are found in some proteins due to exceptions in the universal genetic code are
A. lysine and selenocysteine.
B. pyrrolysine and cysteine.
C. lysine and cysteine.
D. pyrrolysine and selenocysteine.
Answer: D
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Egg whites consist primarily of water and the protein albumin. When you fry an egg, why does the egg white turn from clear to white?
A. The protein becomes dissociated. B. The protein acquires tertiary structure. C. The protein becomes denatured. D. The protein becomes dehydrated.
Which of the following describes an accurate order of events in translation?
A. Ribosomal translocation occurs before the first aminoacyl-tRNA molecule binds to the small subunit. B. Initiation of translation occurs only after the small subunit dissociates from the mRNA. C. The large subunit of the ribosome binds the mRNA before the small subunit. D. The first aminoacyl-tRNA molecule binds to the small subunit before the large subunit binds.
When cells associate with each other they form
A. atoms. B. molecules. C. macromolecules. D. tissues. E. populations.
What organelle and function pair best explains their ability to divide?
A. Chloroplasts and peroxisomes because they both have their own DNA. B. Mitochondria and chloroplasts due to their association with endosymbiosis theory. C. Ribosomes and mitochondria as each is a result of regression theory. D. Peroxisomes and lysosomes are both derived from engulfed bacteria.