You are a doctor examining a patient whose thymus never developed because of a medical condition called DiGeorge syndrome. You know that this medical condition is usually due to the deletion of a section of chromosome #22
The karyotype of this patient shows one copy
of chromosome #22 that is of normal length and one copy that is shortened. This indicates
that the genotype of this patient is _______________ and that the expression of this trait is
_____________.
A. Homozygous dominant; dominant
B. Heterozygous; dominant
C. Heterozygous; recessive
D. Homozygous recessive; recessive
B
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The energy in organic molecules is released in a series of steps because:
A. it is not possible to release it in a single step. B. more total energy is released in multiple steps than would be released in a single step. C. less total energy is released in multiple steps than would be released in a single step. D. more energy can be harvested for cellular use in multiple steps than from a single step. E. only a single electron can be moved at a time in a cellular reaction.
People who are lactose intolerant
A. produce inactive lactase. B. have a genetic polymorphism of the lactase gene that turns off lactase production after weaning. C. must drink soy (non-dairy) formula as infants. D. have a mutation in the promoter region of the lactase gene. E. have mutations in regulatory regions of the lactase gene.
A double-stranded DNA strand contains 26 pyrimidines. How many purines will the copied strand contain?
A. 52 B. 26 C. 13 D. 0
Which of the following is not true of the prokaryotic ribosome?
A. Prokaryotic ribosomes are 70S. B. The small subunit provides the enzymes for making peptide bonds. C. The prokaryotic ribosome has an amino acyl (A) site. D. A prokaryotic ribosome has an exit (E) site. E. A prokaryotic ribosome has a peptide (P) site.