All of the following lead to increased genetic variation in a population EXCEPT
a. migration.
b. dispersal.
c. asexual reproduction.
d. mutation.
C
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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 type of symbiosis in which one member of the relationship benefits with no effect on the other is
A. parasitism. B. mutualism. C. commensalism. D. predation. E. intraspecific competition.
Membrane-bound organelle within a eukaryotic cell that contains chromosomes and controls the structure and function of the cell.
What will be an ideal response?
In order for a malignant cancer to metastasize, it must:
A. lose its connections to adjacent cells. B. lose its connections to the extracellular matrix. C. become motile. D. All of the above are correct.