If a human female has 2 Barr bodies per cell, it is almost certain that
A. her mother also had 2 Barr bodies per cell.
B. her father had 1 Barr body per cell.
C. she developed from a fertilized egg with 3 X chromosomes.
D. she is genetically a male with female characteristics.
E. she is genetically a normal fertile female.
Answer: C
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Polyadenylation of mRNA requires all of the following except:
A. Pol II extends the transcript beyond the site where the poly(A) tail is added. B. The site of poly(A) addition is marked by specific sequence elements in the transcript. C. The transcript is cleaved by an endonuclease that associates with the C-terminal domain of Pol II. D. Polyadenylate polymerase uses a poly(U) RNA template to synthesize the poly(A) tail.
How many types of histone proteins are there?
A. 4 B. 5 C. 7 D. 8
One of the two main angiosperm clades, this group has about 60,000 species that are characterized by
having a single cotyledon and by pollen grains with one groove. Most have parallel-veined leaves.
a. eudicots b. the star anise group c. monocots d. water lilies e. magnoliids
Something is terribly wrong with Beth and Steve's newborn baby girl. A biopsy of her kidneys reveals that the kidney nephrons all have extremely short Loops of Henle. What will be the ultimate fate of the baby?
A. She may die because her kidneys cannot secrete K+ and H+ ions into the nephron tubule. B. She may die because her kidneys cannot reabsorb enough filtered water. C. She will live because the kidneys of fish, amphibians and reptiles function perfectly well without any Loops of Henle. D. She may die because her kidneys cannot filter urea out of the blood. E. She may die because her kidneys cannot reabsorb all the filtered sugars and amino acids.