A chemical is reported to inhibit bacterial replication. Bacterial cells are placed in medium with all nutrients necessary for replication. The chemical is added to the culture, and after a half hour an extract of the DNA is prepared. A significant percentage of the DNA is in pieces about 1000 to 2000 bases in length. The results are consistent with the chemical blocking the function of DNA
ligase.
Indicate whether the statement is true or false
TRUE
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__________ are antigen-presenting cells in the immune system
a. Natural killer cells b. Plasma cells c. Macrophages d. T helper cells e. Cytotoxic T cells
How is a gradient of H+ ions formed across the inner mitochondrial membrane?
A. The electron transport chain uses energy from transfer of an electron donated by NADH to pump H+ across the inner mitochondrial membrane against its electrochemical gradient. B. ATP synthase generates a H+ gradient across the inner mitochondrial membrane. C. Electrons move from NADH to a chain of proteins with lower electronegativities. D. The electron transport chain uses ATP to pump H+ across the inner mitochondria membrane against its electrochemical gradient. E. The electron transport chain of proteins contains pores that are leaky to H+.
Since the optic nerve must pass through the retinal layer, we all have a blind spot devoid of light receptors. This normally goes unnoticed, since the brain attempts to compensate for missing sensory information by filling it in based on surrounding patterns. Which step of the sensory pathway is represented by perceptual filling-in of the physiological blind spot?
A. interpretation B. stimulus C. transduction into receptor potential D. action potential transmission 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 retinal signaling? What other information is related to the question? Choose Answer Given what you now know, what information 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?
To subgroup the lactic acid bacteria, which are incapable of aerobic degradation and only do fermentation, identifying products formed is a useful way to distinguish homofermentative versus heterofermentative lactic acid bacteria
Indicate whether the statement is true or false.