Isotopes of an element are differentiated by their ____.
A. atomic weight
B. number of orbital shells
C. element name
D. mass number
E. electron profile
Answer: D
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A stop codon
A. codes for the stop amino acid s-methyl-methionine. B. forms a hairpin loop forcing the ribosome to fall off. C. codes for no amino acid. D. enhances the binding of the e-polymerase. E. codes for the stop amino acid s-methyl-methionine AND forms a hairpin loop forcing the ribosome to fall off.
Which of the following characteristics are shared by all living organisms?
I. hereditary information is passed to offspring II. adaptation to environmental change III. requirement for nutrients IV. DNA housed in a nucleus
a. I and II b. I and III c. II and III d. I, II, and III e. I, II, III, and IV
What kind of molecules can readily cross the lipid bilayer?
a. Small, charged b. Small, uncharged c. Large or small, uncharged d. Small, charged or uncharged
A base pair is a unit of DNA that consists of:
A) one nucleotide. B) two identical chromosomes. C) one sugar bonded to one phosphate. D) two nucleotides, one on each complementary strand of a DNA molecule. E) a single chromosome.