Which of the following lifestyle changes would NOT boost the immune system?
A. reducing stress by practicing yoga
B. walking 20 minutes a day
C. eating amino acids
D. reducing inflammation by using a cortisol supplement
E. All of these actions will boost the immune system
D. reducing inflammation by using a cortisol supplement
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Irradiation of cells with ultraviolet light may cause
A. four nucleotides to covalently bind together. B. thymine dimers. C. adenine complementary base pairing with cytosine. D. the addition of uracil.
Which one of the following is TRUE regarding enzymes?
A) Enzyme function is not affected by changes in temperature or pH. B) Enzymes slow the rate of chemical reactions in living systems. C) Enzymes are consumed in a chemical reaction, so an organism must constantly replace these enzymes. D) Each enzyme catalyzes one specific reaction or group of reactions. E) Enzymes convert products into reactants.
When the genome of a particular species is said to include 20,000 protein-coding regions, what does this imply?
A. Any other regions are "junk" DNA. B. There are also genes for RNAs other than mRNA. C. Each gene codes for one protein. D. The species is highly evolved. E. There are 20,000 genes.
The codon that signals the end of a growing polypeptide is called initiator code
a. true b. false