Which of the following is incorrect regarding the active site of an enzyme?
a. is unique to that enzyme
b. is the part of the enzyme where its substrate can fit
c. can be used over and over again
d. is not affected by environmental factors such as pH and temperature
Answer: d. is not affected by environmental factors such as pH and temperature
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Within a single motor neuron, what direction does an impulse follow?
a. dendrite ? axon ? cell body b. axon ? dendrite ? cell body c. dendrite ? cell body ? axon d. cell body ? dendrite ? axon e. cell body ? axon ? dendrite
If cell and tissue differentiation is controlled genetically, how can environmental factors play a role in determining the final phenotype?
What will be an ideal response?
What makes phospholipids good at forming cellular membranes?
A. Regions of aliphatic and hydrophilic atoms causing an internalization of phosphorous making a bilayer. B. The polar and non-polar regions create an amphipathic bilayer of phospholipids. C. Covalent and ionic bonds between glycerols create a tight seal around the cell. D. The three saturated fatty tails in phospholipids create a semi solid like structure that maintains a cell's shape.
What is the difference between endocrine and exocrine glands?
a. Endocrine glands are discrete structures, while exocrine glands may be specialized cells in other tissues. b. Exocrine glands produce hormones, while endocrine glands do not. c. Endocrine glands only affect cells in the immediate area, while exocrine glands do not. d. Endocrine glands secrete into the interstitial fluid, while exocrine glands release secretions into ducts. e. Exocrine glands secrete neurohormones, while endocrine glands do not.