_________________ is added to milk to make yogurt.
a. Sour cream
b. Algae
c. Bacteria
Ans: c. Bacteria
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Which of the following drugs is contra-indicated for treating children under the age of 12?
A) tetracycline B) gentamicin C) erythromycin D) amoxicillin
No two people are genetically identical, except for identical twins. The chief cause of genetic variation among human individuals is
A) new mutations that occurred in the preceding generation. B) the reshuffling of alleles in sexual reproduction. C) genetic drift due to the small size of the population. D) geographic variation within the population. E) environmental effects.
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."
Which event occurs during the elongation stage?
a. Peptide bonds form. b. Free amino acids bind to the mRNA binding site. c. Anticodons bind to complementary codons.
d. A stop codon enters the ribosome. e. Peptide bonds form, and anticodons bind to complementary codons.