_____ was the first hominin to leave Africa and did so around _____ million years ago
A. Homo ergaster (H. erectus); 2
B. Ardipithecus ramidus; 4
C. Australopithecus afarensis; 3.2
D. H. neanderthalensis; 0.6
E. H. habilis; 1.7
A
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L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form. C. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. D. Enzymes can only recognize a single, specific stereoisomer.
Microbial plastics are composed of
A) polysaccharides. B) polyhydroxyalkanoates. C) polyaromatic hydrocarbons. D) xenobiotics.
Carbon 14 radioisotopes decay into stable
a. carbon 13 isotopes. b. nitrogen atoms. c. carbon atoms. d. nitrogen 15 isotopes. e. sodium atoms.
Formulate reasons in support of why the duodenum could be described both structurally and functionally as the "crossroads" of the digestive tract
What will be an ideal response?