Differences among organisms are caused by differences in the _____
A) elemental composition from organism to organism
B) types and relative amounts of organic molecules synthesized by each organism
C) sizes of the organic molecules in each organism
D) types of inorganic compounds present in each organism
B
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The variability among polypeptides is primarily due to:
A) noncovalent interactions within the molecule B) addition of a phosphate group C) the length of the polypeptide chain D) the diverse side chains on the different amino acids E) the addition of sulfate groups to some amino acids
Strictly speaking, mitosis _______________.
A. divides the nucleus and doubles the chromosomal number in the progeny cells B. divides the cytoplasm and doubles the chromosomal number in the progeny cells C. divides the chromosomes within the nucleus into two haploid sets D. divides the nucleus and maintains the chromosomal number in the progeny cells E. maintains the structure of the nucleus, cytoplasm, and chromosomes
During DNA replication, which enzyme removes the RNA primers and then fills in the gap?
A. DNA ligase B. DNA polymerase I C. DNA polymerase III D. DNA primase
When an ATP molecule is used to supply energy, which of the following occurs?
A. a phosphate bond is added B. oxygen is added C. oxygen is removed D. a phosphate bond is broken E. an adenine is added