What is the type of bond holding hydrogen and oxygen atoms together in a single H2O molecule?
A) ionic bond
B) covalent bond
C) hydrogen bond
B
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The clonal selection theory implies that
A. related people have similar immune responses. B. antigens activate specific lymphocytes. C. only certain cells can produce interferon. D. memory cells are present at birth. E. the body selects which antigens it will respond to.
Which of the following is NOT true concerning the
root endodermis? a. It regulates the movement of water and minerals into the vascular cylinder. b. It contains a water-impermeable waxy strip. c. It is a layer of cells surrounding the vascular cylinder. d. It forces water to move through its Casparian strip. e. It separates the vascular cylinder from the cortex of a root.
A brown-eyed couple heterozygous for eye color are planning on having two children. What is the
probability that both children will have blue eyes, assuming brown eyes is dominant and blue eyes is recessive? a. 0 b. 1/32 c. 1/16 d. 1/4 e. 1/2
Why must the lenses and specimen be in a vacuum when using an electron microscope?
A. Electrons are highly radioactive, and the chamber must be completely sealed and under vacuum to prevent them from escaping and contaminating the lab area. B. The vacuum bends rays of visible light through the lenses and specimen so that details of the specimen can be clearly visualized from all angles. C. Electrons are particles but there are other particles in air as well. Without a vacuum, the electrons would strike and be scattered by the particles within the air. D. The vacuum fixing the specimen to the slide grid. Without fixing the specimen by vacuum, it would slide off and we wouldn't be able to visualize it. E. None of the answer choices is true.