The plants and animals present in a region from which the trees were removed ten years earlier represent ____
a. primary succession
b. a climax forest
c. pioneer species
d. secondary succession
e. species introduction
ANSWER: d
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Which of the following can cause double-stranded breaks in DNA?
A. ultraviolet radiation B. cosmic rays C. gamma rays D. microwaves E. All of the choices given are correct.
Which is the predominant second messenger
involved in regulating glucose metabolism?
a. ATP b. ADP c. mRNA d. cAMP e. NADH
In addition to several other factors, the overall risks of environmental chemicals depend on genetically determined
variations in the ____ involved in transport, metabolism, and excretion of these chemicals. a. proteins b. body’s oxygen levels c. body’s pH d. ribosomes e. disaccharides
Compared to bacteria which of the cell types below are not responsible for finding food"
A. Lymphocyte B. Macrophage C. Fibroblast D. None of the above E. Answers a, b, and c