At some point in their lives, all chordates have a flexible supporting rod in their backs called a
a) gill
b) backbone
c) notochord
d) nerve cord
Ans: c) notochord
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Mechanisms that help generate heat and those that allow release of heat are an example of ____________________. Collectively, these mechanisms increase the __________________ of body temperature.
A. endothermic regulation; flexibility B. poikilothermic regulation; stability C. ectothermic regulation; flexibility D. antagonist effectors; stability
The results of an experiment
a. don't have to be repeatable. b. should be repeatable by the investigator. c. should be repeatable by other investigators. d. must be both b and c.
Can the atomic mass of an element vary?
A) No, it is fixed. If it changes at all then you have formed a different element. B) Yes. Adding or losing electrons will substantially change the atomic mass. C) Yes. Adding or losing protons will change the atomic mass without forming a different element. D) Yes. Adding or losing neutrons will change the atomic mass without forming a different element.
Which of the following statements concerning endocytosis is TRUE?
A) This process occurs in both prokaryotes and eukaryotes. B) Phagocytosis is a type of endocytosis in which liquids are brought into the cell. C) Endocytosis produces a structure called a food vesicle. D) Waste products and secretions are exported from the cell during endocytosis. E) Endocytosis is a form of passive transport.