Which of the following is not a characteristic of an autosomal dominant disorder pedigree?
A. Two unaffected parents will not have affected children.
B. Heterozygotes are affected.
C. Affected children will usually have unaffected parents.
D. Two affected parents can produce an unaffected child.
E. Both males and females are affected with equal frequency.
Answer: C
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Protein synthesis inhibitors have a low therapeutic index because they usually cannot discriminate between prokaryotic and eukaryotic ribosomes.
Answer the following statement true (T) or false (F)
Phenylketonuria (PKU) is a recessive human disorder in which an individual cannot appropriately metabolize the amino acid phenylalanine. This amino acid is not naturally produced by humans
Therefore, the most efficient and effective treatment is which of the following? A) Feed them the substrate that can be metabolized into this amino acid. B) Transfuse the patients with blood from unaffected donors. C) Regulate the diet of the affected persons to severely limit the uptake of the amino acid. D) Feed the patients the missing enzymes in a regular cycle, such as twice per week. E) Feed the patients an excess of the missing product.
Echinoderms can be best described as ________.
A. eukaryotic autotrophs that lack tissue, but have bilateral symmetry as larva, and a water vascular system B. eukaryotic heterotrophs with tissue, bilateral symmetry as larva, and a water vascular system C. eukaryotic autotrophs with tissue, bilateral symmetry as larva, and a water vascular system D. eukaryotic heterotrophs with tissue, bilateral symmetry as larva, and a blood vascular system
A mass extinction, perhaps caused by a large asteroid hitting Earth near the Yucatan peninsula in the Cretaceous period, produced_____________, which created uninhabitable conditions.
A. active tectonic plate movements that rapidly repositioned continental plates B. All of the answer choices are correct. C. massive volumes of soot, and triggered major climate changes D. forest and range fires over hundreds of years E. a large numbers of volcanic eruptions for millions of years