According to most conservation biologists, the single greatest threat to global biodiversity is _____
A) chemical pollution of water and air
B) stratospheric ozone depletion
C) overexploitation of certain species
D) alteration or destruction of the physical habitat
Answer: D
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Enzyme activity may be regulated by several means. What is the mode of regulation in each of the following examples?
A) allosteric regulation or feedback inhibition B) substrate-level regulation C) inhibition D) proteolytic cleavage 1) When glucose is converted to glucose-6-phosphate by hexokinase, the accumulation of glucose-6-phosphate inhibits the reaction. 2) A foreign substance is added to the reaction in part a above. This substance binds to hexokinase and prevents its ability to catalyze the reaction. E) covalent modification 3) An inactive form of an enzyme becomes active after being phosphorylated. 4) Pepsinogen becomes pepsin after being released into the lumen of the stomach. 5) In a series of enzymatic reactions, it is found that the product of the last reaction inhibits the first enzyme in the series of reactions.
Linked genes are located on ____ chromosomes and do not follow the principle of ____
a. different; independent assortment. b. different; segregation c. the same; segregation d. the same; independent assortment e. sex chromosomes; segregation
Why do scientists reject the use of evolution and genetics to support racists' ideologies?
A. The concept of race is largely useless in a biological context and is really a social myth. B. It is factually incorrect to claim that some populations are "higher," "superior," or "more evolved" than others. C. Studies of human genetics show that the majority of genetic variation is within populations, not among populations. D. Scientific racism is a pseudoscience that begins with a conclusion and misuses data to support it. E. All of the above
Hail and snow are examples of
A. transpiration. B. aquifers. C. precipitation. D. runoff. E. evaporation.