Which of the following best explains why bees aren't attracted to red flowers?
A. Bees perceive red as a warning signal.
B. Bees can't see red.
C. Red flowers usually are odorless.
D. Both because red flowers are odorless and because bees can't see red.
E. All of the other choices provided are incorrect.
B. Bees can't see red.
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A mutation during DNA replication causes a G to be inserted after the first base of the codon for tryptophan. How will this affect the growing polypeptide chain?
A) It will not be affected. B) Elongation will stop prematurely. C) There will be a single amino acid substitution. D) The reading frame will be shifted to the left, and the wrong amino acids will be added from this point on. E) An extra amino acid will be added, but the reading frame will not be affected.
Some ____ are able to metabolize oil and have been used in the cleanup of oil spills.
A. Algae B. Protozoa C. Fungi D. Bacteria
Some regions of chromosomes remain highly condensed, tightly coiled, and untranscribed throughout the cell cycle. These regions are referred to as
A. noncoding DNA. B. single sequence repeats. C. constitutive heterchromatin. D. short interspersed elements. E. transposable elements.
Lipids include _____, oils, and waxes.
Fill in the blank(s) with the appropriate word(s).