The mutant huntingtin protein that results in Huntington disease
A. causes a decrease in production of another protein.
B. leads to degeneration of cells in the brain's striatum.
C. is toxic to brain cells.
D. leads to degeneration of cells in the brain's striatum and is toxic to brain cells only.
E. has all of these traits.
E
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Yeast can grow ________
A) under aerobic conditions only B) under anaerobic conditions only C) under both aerobic and anaerobic conditions D) only in the presence of glucose and aerobically E) only in the presence of lactose and anaerobically
A killing frost is an example of a density-independent factor
____________________ Indicate whether the statement is true or false.
The eukaryotic cell cycle is composed of four phases in the following order:
a. G1; S; G2; M b. G1; G2; S; M c. G1; M; G2; S d. S; G1; G2; M
What type of mutation involves base changes in the gene, which result in a change in the amino acid without affecting the activity of the resulting polypeptide?
a. insertion b. deletion c. silent mutation d. neutral substitution e. null mutation