Female secondary sexual traits, such as functional breasts and fat deposits around the hips and thighs, are determined
by _____.
a. the presence of the master gene, SRY
b. increased concentration of gene products from the two X chromosomes
c. absence of gene products from the Y chromosome
d. sex hormones
e. maternal influence
ANSWER: d
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Antigens specifically associate with an antibody's
A. hinge region. B. heavy chain constant regions only. C. variable regions of the heavy chains and light chains combined. D. light chain variable regions only. E. tail.
Rosalind Franklin's research contribution was
essential in
a. establishing the single-stranded nature of DNA. b. establishing the principle of base pairing. c. establishing most of the principal structural features of DNA. d. sequencing DNA molecules. e. determining the bonding energy of DNA molecules.
Males never give an X chromosome to any of their sons
a. True b. False
How can radiation be controlled and safely used in medicine?
A) Apply radiation throughout the body at uncontrolled doses. B) Apply radiation throughout the body at controlled doses. C) Apply radiation to specific parts of the body at uncontrolled doses. D) Apply radiation to specific parts of the body at controlled doses.