Which of the following microbes produces a neuro-exotoxin?
a. Staphylococcus aureus
b. E.coli 0157:H7
c. Clostridium tetani
d. all of these
Answer: c. Clostridium tetani
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The two amino acids depicted above both have side groups (R groups) that are
a. acidic and polar. b. uncharged and nonpolar. c. basic and polar. d. positively and negatively charged and nonpolar. e. uncharged and polar.
In mitosis, _____
a. the chromosome number is halved b. the chromosome number is doubled c. the chromosome number stays the same d. the chromosome number may double or be halved depending on the species e. gametes are formed
Which of the following species is NOT likely to be considered a keystone species?
a. a top predator, such as a wolf, whose diet serve to control the prey population size, which also indirectly affects the abundance and growth of vegetation b. a fish species that specializes in eating only a few aquatic plant species and that does not form a main component of the diet of the carnivores in the system c. an insect whose foraging movements result in the movement of pollen and fertilization of many kinds of plant species d. all of the above are examples that describe keystone species e. none of the above is an example that describes keystone species
Sharks excrete a small volume of dilute urine
____________________ Indicate whether the statement is true or false.