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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The essence of meiosis is that cells are formed that:
a. receive one copy of each member of each pair of homologous chromosomes. b. receive two copies of each member of each pair of homologous chromosomes. c. receive one member of each pair of homologous chromosomes. d. receive two members of each pair of homologous chromosomes. e. are exact copies of the parent cell.
In photosynthesis C3, plants differ from C4 plants in
A. the way they capture light. B. the way they capture carbon dioxide. C. the kind of chlorophylls they have. D. None of the choices is correct.
Place these steps of enzyme catalysis in the correct order:
1. The substrate and enzyme change shape. 2. The substrate enters the active site. 3. The enzyme reverts to its original configuration. 4. The product is expelled. A) 2, 1, 4, 3 B) 1, 3, 4, 2 C) 2, 3, 1, 4 D) 1, 2, 3, 4 E) 2, 1, 3, 4
In the genetic code
A) some codons specify more than one amino acid. B) some codons consist of two nucleotides. C) some amino acids are not specified by any codons. D) many amino acids are specified by more than one codon.