Which of the following is not true concerning enzymes?
a. enzymes have optimal environmental conditions
b. enzymes are consumed by the reactions they catalyze
c. enzymes can catalyze only one or a very few different reactions
d. all enzymes are proteins
e. enzymes can only catalyze spontaneous reactions

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased

Areal dna molecule consists of thousands of these pairs of nucleotides. what is the pairing arrangement of the nitrogen bases