High blood pressure in mammals reflexively causes a decrease in heart rate, which results in lowered blood pressure. This is a __________ because ____________
A. negative feedback loop; response to the
signal results in a decrease of that signal
B. negative feedback loop; response to the
signal results in an increase of that signal
C. positive feedback loop; response to the
signal results in a decrease of that signal
D. postive feedback loop; response to the
signal results in an increase of that signal
E. None of the above are correct.
A
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On a sunny day, the closing of stomata in plant leaves results in
A. a decrease in CO2 intake B. a shift from C3 photosynthesis to C4 C. an increase in transpiration D. an increase in the concentration of CO2 in mesophyll cells E. an increase in the rate of production of starch
Which of the following groups of organisms is among the most abundant on Earth?
A. primates B. insects C. bacteria D. protozoa
Protein kinase A is activated by
a. phosphorylation of its catalytic subunit. b. phosphorylation of its regulatory subunits. c. binding of cAMP to its catalytic subunits. d. binding of cAMP to its regulatory subunits.
Bacteriophage T4 blocks transcription of host genes using an enzyme that transfers an ________ from NAD onto the alpha subunit of RNA polymerase.
What will be an ideal response?