Reverse transcriptase is an enzyme encoded in the genomes of
A) red blood cells.
B) phage ?.
C) retroviruses.
D) yeast.
E) E. coli.
C) retroviruses.
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John Bernal suggested that prebiotic synthesis of polymers took place on clay because
A. Clay minerals are known to bind organic molecules. B. Clay is negatively charged and attracts cations. C. Some minerals in clay attract organic monomers and catalyze chemical reactions. D. Clay minerals can attract and bind organic molecules, catalyze chemical reactions and attract cations. E. Clay is positively charged and can bind organic molecules for polymerization.
Which sequence represents the most typical order of events in seed germination?
a. shoot cells divide and elongate ? root cells divide and elongate ? seed coat splits ? water imbibition b. seed coat splits ? water imbibition ? root cells divide and elongate ? shoot cells divide and elongate c. water imbibition ? seed coat splits ? root cells divide and elongate ? shoot cells divide and elongate d. water imbibition ? root cells divide and elongate ? seed coat splits ? shoot cells divide and elongate
The peptidoglycan of bacterial cell walls contains a carbohydrate matrix linked together by short chains of:
A. fatty acids. B. steroids. C. nucleotides. D. amino acids. E. water molecules.
The physical appearance and physiology of an organism, resulting from interactions of its genetic makeup and its environment, is its
(a) phenotype. (b) hybrid vigor. (c) dominance. (d) genotype.