Which of the following is an obligate intracellular parasite?
A. M. luteus
B. S. pyogenes
C. Rickettsia rickettsi
D. Pseudomonas spp.
C.
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Once a prophage is present in a bacterial genome, viral genes are reproduced every time the bacterium multiplies. Expression of viral genes, however, is inhibited by a repressor protein. Cell stress can induce the formation of proteases that degrade the repressor. What will result?
A. The virus will enter the lysogenic cycle. B. The bacterium will reject the viral genes. C. The virus will enter the lytic cycle. D. The bacterial genome will be denatured. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about phage induction? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
According to researchers Parmesan and Yohe, how are living systems responding to anthropogenic
global warming?
a. All biomes are remaining intact and all are shifting their distributions northward. b. Some species are moving northward and others are not, so communities are being disrupted. c. All biomes are remaining intact, but some biomes are shifting their distributions and other biomes are not. d. Most plants are shifting their distributions northward, but most animals are not. e. Most animals are shifting their distributions northward, but most plants are not.
What determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration?
A) the presence or absence of bonds with oxygen atoms B) the presence or absence of double bonds between the carbon atom and other atoms C) the polarity of the covalent bonds between carbon and other atoms D) the solvent in which the organic molecule is dissolved
Why is it necessary to take special safety precautions when using radioactivity?
A. Radioactive substances will ionize cells. B. Radioactive substances have the potential to cause damage to living cells. C. Radioactive substances will perforate plasma membranes. D. Radioactive substances decay.