Explain the structural differences between the thick and thin myofilaments.
What will be an ideal response?
A thick filament is composed of several hundred molecules of the protein myosin. Each myosin molecule is shaped like a golf club, with the straight portion of the molecule ending in a globular head, or cross-bridge. The cross-bridges occur on each side of a sarcomere but not in the middle. A thin filament consists of two intertwining strands of the protein actin, with two other proteins, called tropomyosin and troponin, associated with the actin.
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Which of the following methods may introduce foreign DNA into a recipient?
A) transformation B) transduction C) conjugation D) transformation, transduction, and conjugation
A Southern blot is a technique that relies on:
A. hybridization of proteins to a DNA sequence. B. hybridization of RNA to a DNA sequence. C. hybridization of DNA sequences to complementary DNA sequences. D. hybridization of DNA sequences to an RNA sequence. E. hybridization of DNA sequence to a specific protein.
Although race is not a scientifically valid biological concept, health discrepancies do exist by race
Answer the following statement(s) true (T) or false (F)
A survey reveals that 25 percent of a population of 1,000 individuals have attached earlobes (are homozygous recessive for the trait). For the following questions, assume that the population fits the parameters of the Hardy-Weinburg law. If p equals the frequency of the dominant allele and q equals the frequency of the recessive allele, which of the following terms represents the frequency of the individuals who show the dominant phenotype?
a. pxp b. qxq c. 2pq d. pxp +2pq e. pxp + qxq