The first amino acid of a new polypeptide chain is
a. alanine.
b. cysteine.
c. variable.
d. phenylalanine.
e. methionine.
ANSWER: e
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Which of the following is true about the geometry of a chemical bond?
A. Single bonds permit free rotation around the bond resulting in more geometric possibilities. B. Double bonds share two pairs of electrons giving rise to even greater variability. C. Planar bonds have no rotation and therefore give rise to greater geometric possibilities. D. The degree of rotation around a bond determines whether the bond will be single or double. E. The two single bonds of an oxygen atom form a tetrahedron.
Pieces of deoxyribonucleic acid (DNA) that move from one genetic element to another and contain genes for movement and genes for other features are called:
a. transposons. b. insertion sequences. c. plasmids. d. chromatoids.
How many distinct phenotypes exist for a trait controlled by three additive loci?
a. 3 b. 7 c. 8 d. 9 e. 11
A researcher wants to create a mouse model for a disease, to allow her team to study possible therapies. The disease is known to be caused by a small deletion that removes a certain gene. Which type of mouse would be the best choice for this purpose?
A. Conditional knockout mouse activated by a drug B. Tissue-specific gene knockout C. Knockout mouse D. Mutant derived by traditional forward genetics screen E. Knockin mouse