What is the most outstanding characteristic of prokaryotic cells?
a. Prokaryotes have an elaborate system of internal membranes.
b. Prokaryotic cells do not have a cell wall.
c. Prokaryotic cells contain energy-collecting pigments.
d. Prokaryotic cells do not have a nuclear membrane.
e. Prokaryotic cells possess a variety of organelles.
Ans: d. Prokaryotic cells do not have a nuclear membrane.
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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.
CO2 + 6 H2O ? C6H12O6 + 6 O2
Which of the following is FALSE?
a. Water is a reactant. b. C6H12O6 is a product. c. Molecular oxygen is a product. d. CO2 is a reactant. e. Molecular carbon is a reactant.
A phenotype:
a) does not reveal the heritability of traits. b) consists of the observable properties of an individual. c) does not include an organism's behavior. d) cannot change during the course of an organism's life. e) depends on the genome rather than the environment.
The deadliest infectious disease in the U.S. is (hepatitis B/ hepatitis C/HIV)
Fill in the blank(s) with the appropriate word(s).