Among variations in human sex chromosomes, individuals who have a single X chromosome are female, while those with XXY sex chromosomes are males. In order to be a female, a human
A. must have paired XX chromosomes.
B. must have one X chromosome.
C. must have two X chromosomes.
D. must have one Y chromosome.
E. cannot have a Y chromosome.
E. cannot have a Y chromosome.
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Electronegativity is the tendency of an atom to attract ____ to itself in a chemical bond
a. neutrons b. protons c. electrons d. delta forces e. polar associations
Pharmaceutical companies prefer to genetically engineer large animals with human genes because it may be possible to obtain large amounts of the resulting protein from the animals'
A) milk. B) fur. C) blood. D) meat. E) bones.
Which of the following is responsible for the alpha-helical structure of proteins?
a. hydrogen bonds b. ionic interactions c. polar covalent bonds d. hydrophobic interactions e. nonpolar covalent bonds
All of the following mechanisms are used to regulate protein production except
A) protein activation. B) protein breakdown. C) DNA replication. D) the breakdown of mRNA.