Environmental pressures result in a(n) ____ of adaptive alleles
a. decrease in the frequency
b. increase in the frequency
c. assortment
d. removal
e. migration
ANSWER: b
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In specific resistance, if the plant does not have an R protein, which of the following will happen when it comes into contact with a pathogen?
A. The AVR proteins of the virus will not be able to bind and the plant will not become infected. B. The AVR protein will block the plant's basal resistance, allowing the pathogen to infect the cell. C. The AVR protein will activate the plant's defensive genes. D. The AVR protein will bind to a receptor in the plant cell's membrane and a general defense response will be triggered. E. The pathogen will not make AVR proteins if the plant cell lacks the R protein.
Cephalization refers to ____
a. a type of symmetry b. neurons concentrated at the posterior end of an animal c. a net of neural cells d. neurons dispersed throughout the body e. neurons concentrated at the anterior end of an animal
The polymerase chain reaction was developed by:
a. Francis Crick. b. Walter Gilbert. c. E.M. Southern. d. Kary Mullis. e. Leland Hartwell
For children 3 years of age and older, the most useful growth charts are
Select one: a. BMI-for-age. b. head circumference and height-for-age. c. weight-for-height and head circumference. d. weight-for-age and height-for-age.