In pea plants, Y confers yellow peas and y confers green peas. If you cross two heterozygous Yy pea plants, what fraction of the offspring will be yellow?
A. 50%
B. 100%
C. 25%
F. 0%
E. 75%
E. 75%
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Given what you now know, what information is most likely to produce the correct answer?
What will be an ideal response?
Bronchioles differ from bronchi in that they
A) warm air to body temperature.
B) contain only smooth muscle.
C) filter and humidify air.
D) can have alveoli attached to them.
E) are lined by a ciliated epithelium.
Which of the following is an example of a natural cause?
A) Mice arise from discarded garbage. B) Maggots appear spontaneously on rotting meat. C) If you sneeze, you will die. D) Epilepsy is a disease caused by uncontrolled firing of nerve cells in the brain.
Robert Koch helped establish the germ theory of disease by discovering that anthrax was caused by a disease. After he isolated and purified the same bacteria from several diseased animals, what would be the next step in order to show that this bacteria
caused anthrax? A) culture the bacteria on Petri dishes B) perform physiological testing C) visualize the bacteria with an electron microscope D) find out if antibiotics treat the diseased animals E) introduce the bacteria into a new mouse to see if it established the same infection