The enzymes that deal with toxic oxygen-containing molecules is/are
A. glycolase.
B. superoxide dismutase.
C. catalase.
D.
cytochrome oxidase.
E. superoxide dismutase AND catalase.
E
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Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly
A. lysing virus-infected cells and preventing further propagation of the pathogen. B. stimulating components of the immune system through the release of cytokines. C. blocking or reducing the inflammation response in mucous membranes. D. stimulating the production of specific antibodies. E. recruiting macrophages to the nasal epithelium.
Summarize the scientific and ethical advantages and disadvantages of using embryonic stem cells versus adult stem cells for stem cell therapies
What will be an ideal response?
The phrase "double fertilization" in angiosperms is best described by which of the choices below?
a. Two pollen grains land on the same stigma. b. Each pollen grain contains two sperm cells; one leads to the fertilization that produces the embryo and the other leads to the fertilization that produces the endosperm. c. Each angiosperm is fertilized twice during a particular mating season and produces two offspring. d. Two sperm cells fertilize the same egg cell that leads to the embryo. e. Each pollen grain contains two sperm cells and each fertilizes its own egg.
The process of bacterial transformation was discovered by __________ in __________
a. Frederick Griffith; 1928 b. Francis Crick; 1953 c. Martha Chase; 1952 d. Matthew Meselson; 1958 e. Rosalind Franklin; 1953