The letter “C” in the above figure represents
a. transverse.
b. radial.
c. tangential.
d. elliptical.
e. obtuse.
Answer: a
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Choose the option that places the following events in plant defense in the correct order:
1. Plant cell recognizes double-stranded RNA (dsRNA) as foreign and cleaves it into fragments. 2. Single-stranded RNA (ssRNA) molecules bind to the protein-bound small interfering RNA (siRNA) and are destroyed. 3. A virus infects the host plant, injecting ssRNA into the cell. 4. Viral genome is replicated and dsRNA molecules are formed. 5. siRNA bind to a plant protein complex, which retains only one of the RNA strands. A. 3 2 1 4 5 B. 1 2 4 3 5 C. 5 3 4 2 1 D. 1 2 3 4 5 E. 3 4 1 5 2
A newly defined autoimmune disorder has resulted in an immune response against Type V collagen fibers. As a result, the most likely organ to be targeted in this response would be the
A) skin. B) heart. C) lungs. D) stomach. E) tongue.
Anabolic reactions may be characterized as
A) exergonic. B) breaking large molecules into smaller molecules. C) forming large molecules from smaller molecules. D) producing ATP. E) breaking large molecules into smaller molecules to produce ATP.
The large diversity of biological molecules depends on the element ________. This element can make stable bonds to itself and to atoms of other elements. Without this element, the large macromolecules that make up most of the molecules in living organisms would not be possible.
A. carbon B. hydrogen C. nitrogen D. oxygen