Which of the following statements about mitochondria is true?
a. all protists have mitochondria
b. some protists are descended from early eukaryotes that never had mitochondria
c. all living protists are descended from a common ancestor that had mitochondria
d. some protists lost their mitochondria as an adaptation to a predatory lifestyle
e. some protists lost their mitochondria as they became photosynthetic
C
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What is the correct order of the components of a negative feedback loop?
a. stimulus ? integrator ? sensor ? effector(s) ? compensatory response b. stimulus ? sensor ? integrator ? effector(s) ? compensatory response c. stimulus ? effector(s) ? integrator ? sensor ? compensatory response d. sensor ? integrator ? stimulus ? effector(s) ? compensatory response e. sensor ? stimulus ? integrator ? effector(s) ? compensatory response
Which protein combines with cyclins to exert local control of the cell cycle?
A) phosphatase B) integrase C) ATPase D) hexokinase E) cyclin-dependent kinase
Suppose that a person takes a medication that blocks the neurons' ability to be stimulated by a specific chemical signal. What part of the neuron is most likely being affected by the medication?
a. the axon b. the cell body c. the axon terminal d. the dendrites
What are the final electron acceptors for the electron transport chains in the light reactions of photosynthesis and in cellular respiration?
a. O2 in both b. CO2 in both c. H2O in the light reactions and O2 in respiration. d. P700 and NADP+ in respiration e. NADP+ in the light reactions and O2 in respiration in the light reactions and NAD+ or FAD