Please match the virulence factor of Streptococcus pyogenes to its description.
M protein
A) Surface antigen that serves as the basis for alphabetical grouping; protects bacterium from lysozyme
B) Toxin that causes beta-hemolysis on blood agar and injures cells of the host
C) Enzyme that plays a role in invasion by leading to the digestion of fibrin clots
D) Projecting surface antigen that facilitates adherence and resists phagocytosis
E) Chemical surface layer that prevents an immune response by the host
F) Enzyme that promotes invasion into tissues by breaking down the binding substance in connective tissues
D) Projecting surface antigen that facilitates adherence and resists phagocytosis
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Some dogs have erect ears; others have drooping
ears. Some dogs bark when following a scent; others are silent. Erect ears and barking are due to dominant alleles located on different chromosomes. If two dihybrids are crossed, a. the most common phenotype is drooping ears and barking. b. all droopy-eared, silent offspring are purebreeding. c. the least common phenotype is drooping ears and barking. d. there will be no phenotypes or genotypes that resemble the original parents. e. there will be no offspring that resemble the F1 generation.
When experimenting with Streptococcus pneumoniae in the 1920s, Griffith concluded that some substance from the dead S strain bacteria passed to the R strain bacteria, imparting virulence and the ability to form a capsule. Avery and others continued the search for the substance that "transformed" the R strain into the S strain.Hypothesis I:Genetic material or "transforming substance" is protein.Hypothesis II:Genetic material or "transforming substance" is RNA.Hypothesis III:Genetic material or "transforming substance" is DNA.An experiment was performed that demonstrated that DNA extracted from the S strain bacteria transformed R strain bacteria. This finding
A. supports Hypothesis I. B. supports Hypothesis II. C. supports Hypothesis III. D. rejects Hypothesis I only. E. rejects Hypothesis II only. F. rejects Hypothesis III only. G. does not support any of these hypotheses.
Which of the following is considered to be a hunger peptide?
(a) neuropeptide Y (b) glucagon (c) bombesin (d) somatostatin
A neuron that stimulates a muscle cell is called a(n)
A. association neuron. B. sensory neuron. C. myofilament. D. motor neuron.