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.
Answer: D
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The rungs of the DNA ladder are formed by base pairs
a. joined by covalent bonds. b. joined by hydrogen bonds. c. joined by ionic bonds. d. NOT joined to each other
Deep-diving animals accomplish their dives through
all of the following means EXCEPT by a. redirecting blood flow. b. conserving energy by gliding rather than swimming. c. relying primarily on anaerobic respiration during deep dives. d. binding oxygen to myoglobin and hemoglobin. e. assuring that the brain has an uninterrupted supply of ATP.
There are ________ major phyla in the kingdom Protista.
Fill in the blank(s) with the appropriate word(s).
Which of the following factors influence the rise in ventilation during exercise? (Select all that apply.)
a. A rise in K+ in the blood during heavy exercise b. A drop in PO2 in the blood c. Feedback from sensory neurons in the skeletal muscles d. Input from centers of the brain driving locomotion