Ribozymes may have originally developed by
a. ATP synthesis.
b. the chance assembly of RNA molecules.
c. cellular respiration.
d. glycolysis.
e. electron transfer systems.
B
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Interneurons in the spinal cord release ____ when signals from pain receptors reach them
a. bradykinins. b. histamines. c. prostaglandins. d. substance P. e. leukotrienes.
Give some examples showing how cells respond to signals. How are signals terminated? What will be an ideal response?
Some tissues need to be able to expand and contract, such as lungs during breathing and intestines during digestion. Predict which ECM protein would be abundant in these tissues.
A. glycosaminoglycans B. laminin C. elastin D. collagen E. fibronectin
Suppose we are proving the statement that if two integers are even, then their sum is even. We execute the proof by first showing that if integer A and B are even, then they can be defined as A = 2k and B = 2m. We then note that their sum must be A + B = 2(k + m), which must be even. This is an example of what type of proof?
A. Direct proof B. Proof by transposition C. Inductive reasoning D. Proof by induction