Sickle cell anemia is a genetic disease caused by the replacement of one amino acid in the hemoglobin
molecule. This replacement changes the shape and function of the hemoglobin protein in dramatic
ways, which can sometimes be lethal. How can the substitution of one amino acid lead to such drastic
results?What will be an ideal response?
Concepts to Consider: Amino acid sequence determines primary structure; primary structure affects
the shape of proteins; the shape of proteins determines their function.
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When does a CAM plant take in atmospheric CO2?
a. daytime only b. nighttime only c. summer only d. winter only e. anytime the Calvin cycle is occurring
Which of the following is a bacterial infection that can cause the uterine tubes to be blocked by scar tissue?
A) Chlamydia B) Genital herpes C) HIV D) Trichomoniasis E) HPV
In some ciliate protozoa, the codons UAA and UAG encode glutamate, rather than acting as stop codons. How does this compare to other species?
A. This is not unusual-while most species have a similar genetic code, there are often variations for some of the amino acids. B. This is unusual-almost all species share the same universal genetic code. C. This is typical-every species has its own unique genetic code.
Which statement describes the function of the histones in eukaryotic cells?
A) They help the double-stranded DNA molecule unwind from its coiled-up configuration. B) They help direct the dividing of the cytoplasm into two daughter cells. C) They function as catalysts in the replication phase of cell division. D) They enable DNA to be tightly and efficiently packed inside the nucleus. E) They serve as the attachment site for the chromosomes before replication.