Which of the following structures shorten during muscle contraction?
(a) myosin filaments
(b) flagella
(c) sarcomeres
(d) actin filaments
(c) Sarcomeres contain actin filaments and myosin filaments that slide past each other during muscle contraction, leading to shortening of the sarcomere; the actin filaments and myosin filaments do not change in length. Flagella are microtubule-based structures that are not present on muscle cells.
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What are the four major classes of chromosomal rearrangements?
A) inversions, duplications, translocations, deletions B) duplications, reciprocal translocations, nonreciprocal translocations, inversions C) deletions, inversions, duplications, point mutations D) translocations, pericentric inversions, paracentric inversions, deletions
The proportion of individuals in a population that are of a particular genotype is the
A) phenotype frequency. B) genotype frequency. C) allele frequency. D) None of the choices is correct.
A plant that requires two years to complete its life cycle is referred to as a(n):
a. biennial. b. annual. c. perennial. d. dicot. e. monocot.
The BRAC1/BRCA2 genes are involved in regulating:
A. Cell division B. Cell death C. DNA repair D. DNA replication E. Apoptosis