In what host cell protein is the ?32 mutation found, and what type of mutation is this?
What will be an ideal response?
The ?32 mutation is found in the CCR5 coreceptor on CD4 helper T cells, and is a 32-base pair deletion.
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The DNA-binding site for the lactose repressor was identified by:
A. causing cleavage and subsequent methylation at purine residues. B. methylating and hence protecting the DNA. C. comparing DNA sequences protected by wild-type and mutant repressors. D noting the DNA sequences that were protected from methylation by the repressor. E. reading the DNA sequence that was methylated by DMS after repressor binding.
Which of the following actions occurs in many plants when CO2 concentrations are high?
A. Guard cells lose turgor, and the stomata close. B. Water evaporates at a higher rate than usual. C. CAM photosynthesis fixes CO2 at night. D. Oxygen is used by plants for photosynthesis. E. Calcium ions are transported faster through the phloem.
The protein that helps make vertebrate skin tougher and more waterproof is:
a. collagen b. elastin c. hemoglobin d. keratin e. melanin
What would be the best approach to curbing excessive human population growth?
A. Embracing traditional agricultural practices B. Lowering birth rates through education and family planning C. A return to historical health care practices D. Encouraging women to postpone children till after age 35