T cells interact with the peptide-MHC complex using
A) cytokines.
B) granzyme and perforin.
C) T-cell receptors.
D) the antibodies present on the surface of the cell.
Answer: C
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Gene regulation may entail
A. turning on genes only when needed. B. turning off genes when not needed. C. turning on or off entire groups of genes. D. All of the choices are correct.
PCR produces
A. DNA fragments of all possible sizes. B. DNA fragments that are one nucleotide larger than the next fragment. C. DNA fragments of a particular size. D. DNA fragments of increasing size. E. DNA fragments that are one nucleotide larger than the next fragment AND DNA fragments of increasing size.
Which of the following is a characteristic of most annelids?
a. Chitinous hairs b. Paired, unjointed limbs c. Temporary gonads d. Scraping structures
Which of the following statements about genome-wide association studies (GWAS) is false?
(a) GWAS use SNPs to compare populations of people with disease and people without disease to look for SNPs more likely to be present in those with disease. (b) GWAS can be used even if more than one gene can cause the disease of interest. (c) Sometimes GWAS will identify SNPs that are associated with a disease but these SNPs do not affect the gene product of the gene that causes the disease. (d) Studies using GWAS only examine SNPs that occur very rarely (<0.001%) in the population, as those SNPs are most likely to cause disease.