Enzymes function by
(a) being consumed (used up) in the reaction.
(b) lowering the activation energy of a reaction.
(c) combining with otherwise toxic substances in the cell.
(d) adding heat to the cell to speed up the reaction
(b) lowering the activation energy of a reaction.
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The difference between a nucleotide and a nucleoside is the presence of which of the following?
A. a phosphate group B. a pentose sugar C. a hydroxyl group D. a nitrogenous base E. an amino group
Fibroblasts are present in which tissue type?
a. connective tissue b. epithelium c. muscle d. nervous tissue e. all tissue types
Gases such as nitrous oxide and carbon dioxide are called greenhouse gases because they
A) block sunlight from reaching Earth. B) block specific wavelengths of sunlight from penetrating. C) permit sunlight to enter but trap the heat energy in the atmosphere. D) block both sunlight and heat energy from penetrating the atmosphere. E) stimulate photosynthesis in most plants.
In a wild-type strain of fruit flies, the length of a gene from the start to the stop codon is 2,000 DNA bases. Suppose an experiment indicated that the mRNA molecule transcribed from this gene is much shorter (only 1,200 bases)
What is the most likely explanation for this? A) There are introns in the DNA that were cut out of the mRNA. B) The mRNA was prematurely degraded. C) A mutation caused the formation of an extra stop codon in the gene. D) The first 800 bases of DNA are always cut out as it is transcribed into mRNA.