The concept of a species was proposed by
A. John Ray.
B. George Cuvier.
C. Charles Darwin.
D. Erasmus Darwin.
E. Carolus Linneaus.
Answer: A
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Streptokinase is an enzyme produced by streptococcal bacteria. This enzyme can lyse clots. Streptokinase is harvested from culture media and filter sterilized
This purified enzyme is injected into heart attack patients to dissolve clots that may be present in coronary arteries. Why does this injection not harm the patient? A. The enzyme is highly specific. B. The enzyme will digest all proteins in the blood. C. The enzyme may damage the collagen in the wall of the capillaries. D. The enzyme causes the patient to run a fever. E. The enzyme is denatured at body temperature.
How do endophytes differ from endomycorrhizal fungi?
A. Endophytes live within leaves, whereas endomycorrhizal fungi live within roots. B. Endomycorrhizal fungi are beneficial to the plant, whereas endophytes are harmful. C. Endophytes are unicellular, whereas endomycorrhizal fungi are multicellular. D. Endophytes help plants absorb nutrients, whereas endomycorrhizal fungi help plants defend against predators and pathogens. E. Endophytes penetrate into plant cells, whereas endomycorrhizal fungi live within and between plant cell walls.
The evolutionary ancestors of mitochondria are believed to have been ancient
a. Archaea. b. cyanobacteria. c. proteobacteria. d. green bacteria. e. Gram-positive bacteria.
A root hair is an extension of an endodermal cell
____________________ Indicate whether the statement is true or false.