In replication, once the DNA strands have been separated, reformation of the double helix is preventedby:a
DNA helicase enzyme.
b. single-strand binding proteins.
c. DNA polymerases.
d. ATP.
e. GTP.
B
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What would result from a single nucleotide deletion (point mutation) within the coding sequence of a structural gene?
A. a silent point mutation with no deleterious effects B. a missense point mutation resulting in the change of one amino acid C. a nonsense point mutation resulting in the generation of a premature stop codon D. a frameshift mutation, producing a different amino acid sequence altogether E. All of the choices are possible.
The inner membrane system of chloroplasts consists of flattened sacs called ________ that form stacks called ________.
Fill in the blank(s) with the appropriate word(s).
The following amino acid would be characterized as ____ based on the chemical properties of its side chain
a. basic
b. acidic
c. nonpolar
d. hydrophilic
e. electrically charged
Sperm and egg cells contain half the number of chromosomes found in somatic cells, and are referred to as ________, which comes from the Greek word haploos, meaning "single."
Fill in the blank(s) with correct word