Regulation of the passage of food from the stomach is accomplished by
A) peristalsis.
B) nutrient absorption.
C) sphincters.
D) the stomach lining.
Answer: C
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Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain becomes nonlethal. Type R Streptococcous pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse?
A. The S strain would be transformed into the nonvirulent R strain and kill the host. B. The R strain would be transformed into the virulent S strain and kill the host. C. The S strain would be transformed into the nonvirulent R strain and not affect the host. D. The R strain would be transformed into the virulent S strain and not affect the host. E. Neither the S nor the R strain would change.
A symptom of a transmissible spongiform encephalopathy (TSE) is:
a. degeneration of the digestive tract. b. progressive immune deficiency. c. degeneration of the brain and central nervous system. d. inflammation of the reproductive organs. e. influenza-like symptoms
How are binary fission and mitosis different?
a. Binary fission is found in eukaryotes, and mitosis is found in prokaryotes. b. Binary fission is used for repair, and mitosis is not. c. Binary fission is found in prokaryotes, and mitosis is found in eukaryotes. d. Binary fission is a division of the nucleus, and mitosis is a division of the cytoplasm.
Which of the following statements is false?
A) Translation consists of initiation, elongation, and termination. B) During polypeptide initiation, an mRNA molecule, the first amino acid attached to its tRNA, and the two subunits of a ribosome are brought together. C) The start codon can be different depending on what kind of protein is to be translated. D) During the first step of initiation, an mRNA molecule binds to a small ribosomal subunit.