The “sixth mass extinction” refers to

a. the end of the dinosaur era
b. the rise of predators during the Cambrian period
c. what will happen to the human species after a nuclear war
d. the rapid loss of biodiversity due to degradation of the environment by humans
e. what happened when insects evolved on land


D

Biology & Microbiology

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The Bartlett pear and McIntosh apples are example of commercially important fruits that come from plants produced by ____

a. fragmentation b. tissue culture c. somaclonal selection d. grafting e. apomixes

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Which of the following bridges the gap

between a neuron sending a message and the neuron receiving it? a. threshold value b. action potential c. transmitter molecules d. a neurohormone e. all of these

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What conclusions did Beadle and Tatum reach in their studies of Neurospora?

a. Each mutant gene affected three enzymes. b. Each mutant gene affected a pair of enzymes. c. Each mutant gene affected only one enzyme. d. Mutant genes had no effect on the enzymes produced by the cells. e. Each mutant gene affected as many enzymes as were present in a particular metabolic pathway.

Biology & Microbiology

Jena and Seth could have a child with hemolytic disease of the newborn. Jena must be

A. Rh-negative. B. a carrier for anemia. C. Rh-positive. D. blood type O. E. blood type A.

Biology & Microbiology