Sturtevant's detailed mapping studies of the X chromosome of Drosophila supported what genetic principle?
A) That genes are arranged in a linear order on the chromosomes.
B) That genes are carried on chromosomes.
C) That sex determination is controlled by the X and Y chromosomes.
D) That segregation of an allelic gene pair is accompanied by disjunction of homologous chromosomes.
E) That different pairs of chromosomes assort independently.
A) That genes are arranged in a linear order on the chromosomes.
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The first stable compound produced from CO2
in the light-independent reaction is a. phosphoglycerate (PGA). b. ribulose bisphosphate (RuBP). c. phosphoglyceraldehyde (PGAL). d. O2. e. NADP+.
Specific immunity provides long-lasting protection through the production of ________.
A. antibodies B. T helper cells C. memory cells D. phagocytotic cells E. plasma cells
The male gametes, pollen grains of the flower, are formed in the
a. gynoecium b. anters c. perianth d. stigma e. style
Which of the following does NOT lead to development of penicillin resistance?
a) acquisition of a beta-lactamase gene b) direct binding to the bacterial ribosome c) loss of transpeptidase affinity for penicillin d) a modification in the cell wall that blocks penicillin entry