The nucleotide sequences on DNA that actually have information encoding a sequence of amino acids are
A. exons.
B. introns.
C. enhancers.
D. proteins.
Answer: A
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Viral envelopes are composed of
A. lipids. B. carbohydrates. C. proteins. D. All of the choices are correct.
A population of lizards lives in a rocky area next to a desert. Some lizards are light colored and blend into the sand. Others are dark and blend into the rocks. What may happen to this population of lizards over time?
A. They may evolve into two separate species as a result of directional selection. B. They may remain one species as a result of stabilizing selection. C. They may remain one species as a result of disruptive selection. D. They may evolve into two separate species as a result of disruptive selection. E. They may remain one species as a result of directional selection.
The tree above is based on which type of traits and what is the genus name for the most recent horse?
A. Genetic (DNA): Orohippus.
B. Morphological: Equus.
C. Molecular: Equus.
D. Genetic homology: Pliohippus.
E. Morphological: Hyracotherium.
Which of the following types of plasmids allows a bacterial cell to kill its competitors?
A) virulence plasmids B) fertility plasmids C) bacteriocin plasmids D) resistance plasmids E) cryptic plasmids