A human individual is phenotypically female, but her interphase somatic nuclei do not show the presence of Barr bodies. Which of the following statements concerning her is probably true?
A) She has Klinefelter syndrome.
B) She has an extra X chromosome.
C) She has Turner syndrome.
D) She has the normal number of sex chromosomes.
E) She has two Y chromosomes.
Ans: C) She has Turner syndrome.
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In the traditional phylogeny (A), the phylum Platyhelminthes is depicted as a sister taxon to the rest of the protostome phyla and as having diverged earlier from the lineage that led to the rest of the protostomes
In the molecular phylogeny (B), Platyhelminthes is depicted as a lophotrochozoan phylum. What probably led to this change? A) Platyhelminthes ceased to be recognized as true protostomes. B) The removal of the acoel flatworms (Acoela) from the Platyhelminthes allowed the remaining flatworms to be a monophyletic clade clearly tied to the Lophotrochozoa. C) All Platyhelminthes must have a well-developed lophophore as their feeding apparatus. D) Platyhelminthes' close genetic ties to the arthropods became clear as their Hox gene sequences were studied.
Cells in the juxtaglomerular apparatus secrete ____ in response to a significant drop in blood pressure or blood
volume.
a. atrial natriuretic factor b. renin c. aldosterone d. antidiuretic hormone e. angiotensin
The sugars in DNA and RNA ____
a. have a different number of carbon atoms
b. have the same structural formulas c. are the two components of sucrose d. are monosaccharides e. are disaccharides
If lipase breaks lipids into fatty acids and glycerol, then lipase can
A. cause an additional breakdown of the fatty acid. B. cause the formation of lipids. C. work on amino acids. D. denature proteins.