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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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.
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?