As prokaryotes, which structure is found in cyanobacteria?
a. nucleoid
b. mitochondrion
c. nucleus
d. all of these
A
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Which of the following is not a part of the type II topoisomerase mechanism?
A. The enzyme breaks two strands, each one forming an enzyme-linked intermediate through tyrosines in the active site. B. The double-stranded segment of DNA that passes through the break is released through the C-gate. C. ATP binding and hydrolysis are required for creating the double-stranded break. D. ATP hydrolysis is coupled to the passage of the unbroken double-stranded DNA segment through the break. E. The religated strand stays associated with the topoisomerase as it resets for another round of catalysis.
Neuropeptide neurotransmitters ____
a. can act as direct neurotransmitters between neurons and muscle cells b. can act as postsynaptic membrane inhibitors c. directly open K+ channels to inhibit neurons d. can act as pain reducers and initiate euphoria e. directly inhibit euphoria
Evidence exists that atmospheric CO2 has increased over the last several decades, due to human activities. How could increased CO2 levels affect the pH of Earth's waters?
a. Due to the formation of carbonic acid, increased CO2 levels will increase the pH of Earth's waters. b. Due to the formation of carbonic acid, increased CO2 levels will decrease the pH of Earth's waters. c. Due to the formation of carbonic acid, increased CO2 levels will cause Earth's waters to become neutral. d. It will not affect the pH of Earth's waters, as atmospheric CO2 is not located in oceans.
The transfer of a phosphate group to a molecule or compound is called
A) carboxylation. B) ionization. C) phosphorylation. D) hydrogenation.