Which portion of an amino acid is unique among the different amino acids?
A. carboxyl
B. amino
C. hydrocarbon
D. the side chain or R-group
E. peptide bonding
D. the side chain or R-group
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The alternative pathways for viral infection—lytic and lysogenic—are determined by positive and negative regulatory effects of proteins produced by the virus following infection
A. true B. false
Chancroid
A. presents with a hard chancre. B. is caused by Haemophilus ducreyi. C. is very painful in both sexes. D. is caused by a spirochete.
The most humanlike australopith discovered so far is ____
a. Australopithecus afarensis b. Australopithecus africanus c. Australopithecus ramidus d. Australopithecus sediba e. Australopithecus kadabba
To be classified as a eukaryote, an organism must have
A) centrioles. B) a cell wall. C) flagella. D) internal membranes. E) sexual reproduction.