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.
B
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What is a key morphological difference between fish and amphibians?
A. Fish have gills to extract oxygen from water. B. Amphibians have strong muscular and skeletal systems to support their body on land. C. Amphibians have amniotic eggs. D. Fish have a lateral line system.
Which of the following play a central role in animal camouflage?
a. pattern and simple colour b. pattern and behaviour c. simple colour and behaviour d. simple colour, pattern, and behaviour
Properties that contribute to virulence
A) are determined by both the microbe and the host, and are fixed and unchanging. B) are determined solely by the microbe. C) are determined solely by the host. D) are fixed and unchanging. E) are determined by both the microbe and the host, and may evolve over time.
Two species of frogs belonging to the same genus occasionally mate, but the offspring do not complete development. What is the mechanism for keeping the two frog species separate?
A) the postzygotic barrier called hybrid inviability B) the postzygotic barrier called hybrid breakdown C) the prezygotic barrier called hybrid sterility D) gametic isolation E) adaptation