Persons having an XXY karyotype are nearly normal males but produce few or no sperm. They have
__________ syndrome.
a. Turner
b. Klinefelter
c. Down (trisomy form)
d. Phenylketonuria
e. Down (translocation form)
B
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What is the term for metabolic pathways that release stored energy by breaking down complex molecules?
A) anabolic pathways B) catabolic pathways C) fermentation pathways D) thermodynamic pathways E) bioenergetic pathways
A vascular bundle
A. contains xylem and phloem. B. is not found in leaves. C. is usually scattered in the stem of a eudicot. D. is on the outer surface of a root. E. is very distinct in the apical meristem.
Which of the following is an example of positive gene regulation?
(A) the tryptophan gene, in which the presence of tryptophan functions as a corepressor to prevent its own transcription (B) The lac gene in which the repress or preventing the synthesis of the enzymes that degrade lactose is deactivated by the presence of lactose (C) CAP, which acts as a required transcription factor for the enzymes that degrade lactose (D) inducible operons in which the inducer is a substrate
The strongest chemical bonds are
A. Van der Waal forces. B. hydrophobic interactions. C. covalent bonds. D. hydrogen bonds. E. ionic bonds.