Codons are three-base sequences in mRNA. Which information is specified by a codon?
A) a complete trait, or characteristic, of an organism
B) the amino acid sequence of an entire protein
C) an amino acid to be added to a growing chain
D) the nucleotide that comes next in a DNA sequence
Ans: C) an amino acid to be added to a growing chain
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The genes of the human leukocyte antigens (HLA) system encode cell surface
A) phospholipids. B) glycolipids. C) glycoproteins. D) histamines.
Which of the following is not an important component of the long-distance transport process in plants?
A) the cohesion of water molecules B) a negative water potential C) the root parenchyma D) the active transport of solutes E) bulk flow from source to sink
How do spheroplasts and protosplasts differ?
A. Spheroplasts form from cocci and protoplasts form from bacilli. B. Spheroplasts retain the peptidoglycan but protoplasts do not. C. Spheroplasts retain their outer membrane but protoplasts do not. D. There is no difference; these terms are synonyms.