Epithelial cells are more likely to become
cancerous than other tissue cells because
epithelial cells
a. lack a nucleus.
b. are always exposed to the external
environment.
c. are only found in simple tissues.
d. do DNA replication more often.
e. have an extensive blood vascular system
D
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Scanning electron microscopes bombard specimens with a stream of electrons; however, the specimen image is produce by electrons that are derived from atoms of the specimen itself rather than by the electrons used to bombard the specimen.
Answer the following statement true (T) or false (F)
Where does the Calvin cycle of photosynthesis occur?
A) stroma B) outer chloroplast membrane C) thylakoids D) rubisco
When a cutting from a plant sprouts roots and yields a new, independent plant, what process has occurred?
A) self-fertilization B) asexual reproduction C) cytokinesis D) sexual reproduction E) recombination
Diploid organisms are so described because _____.
A) each characteristic is influenced by one or more genes B) each gene has a specific locus on a chromosome C) a particular gene may occur in a variety of molecular forms D) each gene is paired with another located at the same locus on a homologous chromosome