When a gamete that is lacking a sex chromosome due to nondisjunction has fused with a gamete carrying an X chromosome, this type of abnormality leads to the _________ .
A. Triple X syndrome
B. Down Syndrome
C. Edward Syndrome
D. the Turner syndrome
E. Klinefelter Syndrome
D. the Turner syndrome
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The development of acute rheumatic fever and subsequent valvular heart disease are problems that may be encountered by patients infected with:
a. Enterococcus faecalis. b. S. pneumoniae. c. S. pyogenes. d. S. agalactiae.
Adding acetyl groups to a histone regulates gene expression by allowing transcription to proceed by
a. increasing the pH of the cell. b. loosening the DNA wound around the histone. c. modifying the nucleotides of the promoter region of the DNA molecule. d. enhancing the activity of RNA polymerase. e. enhancing the development of a DNA-RNA hybrid.
Metabolic pathways that build cellular molecules are
1.catabolic pathways. 2.exergonic pathways. 3.anabolic pathways. 4.at equilibrium. 5.biological pathways.
The difference between a drupe and a berry is that a drupe:a
is an accessory fruit, while a berry is a multiple fruit. b. is formed from a single carpel, while a berry is formed from many carpels. c. has a stony pit around a single seed, while a berry is fleshy throughout with many seeds. d. is a dry fruit, while a berry is a fleshy one. e. splits open along two sutures, while a berry splits open along one suture.