Sex-linked genes are located on
A) the autosomal chromosomes.
B) the Y chromosome only.
C) the X chromosome only.
D) both the X chromosome and the Y chromosome.
Ans: D) both the X chromosome and the Y chromosome.
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Sickle cell anemia is a recessive trait in humans. In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the sickle cell allele, what is the probability that all of their first three children will be unaffected?
A) 1/4 B) 1/2 C) none D) 1/8 E) 1/16
Which of the following gases was not present in the Earth's early atmosphere but appeared after the
evolution of certain organisms? a. hydrogen b. methane c. nitrogen d. oxygen e. carbon dioxide
Quaternary structure of a protein refers to ________
A) the sequence of amino acids in a polypeptide B) alpha-helical or beta-sheet arrangements of protein structure C) three-dimensional coil of a polypeptide around itself D) the association of multiple polypeptide subunits to form a functional protein E) the number of amino acids in a polypeptide chain
Which of the following is a disadvantage for animals living in groups?
A) Increased chance of being spotted by predators B) Reduced chance of finding a mate C) Decreased risk of disease D) Lower efficiency in finding food