Frederick Griffith was a microbiologist who observed that
A) DNA contains nitrogen and phosphorus.
B) proteases disrupt transformation from nonvirulence to virulence.
C) DNA from heat-killed viruses transforms virulent viruses.
D) nonvirulent bacteria become virulent when mixed with heat-killed virulent bacteria.
D) nonvirulent bacteria become virulent when mixed with heat-killed virulent bacteria.
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Pure-breeding yellow guinea pigs crossed with pure-breeding white ones produce only cream-colored
offspring. This pattern indicates incomplete dominance. Rough hair is found to be dominant to smooth hair. Give the F1 and F2 genotypic and phenotypic ratios of a cross of a smooth, white guinea pig with a homozygous, rough, yellow guinea pig. What will be an ideal response?
Predict the most immediate consequence of the inflammation of the pleural sac in a human.
A. Lung volume would decrease. B. Gas exchange would decrease. C. Hemoglobin's oxygen affinity would decrease. D. Respiratory muscle activity would decrease.
The function of the prostate gland is to:
A. manufacture and store sperm. B. supply a fluid that increases acidity in the urethra. C. supply a fluid that prevents the destruction of sperms. D. manufacture male sex hormones.
During ventricular systole (contraction):
a. the ventricles relax. b. blood flows from the ventricles into the atria. c. the tricuspid and mitral valves are open. d. blood flows from the ventricles to the pulmonary artery and aorta. e. the atria contract.