In a multicellular organism, nerve cells are different from muscle cells because
a. each cell type has a unique set of transcription factors and repressors, so it expresses a specific set of genes
b. each type of cell within a multicellular organism contains a different set of genes
c. random events within each cell regulate the expression of genes and result in different genes being expressed in different cells
d. cells gain and lose different genes during embryonic development, so each cell in an adult only has some genes from the original set
Answer: a. each cell type has a unique set of transcription factors and repressors, so it expresses a specific set of genes
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A. dendrite. B. cell body. C. axon terminal. D. axon hillcock. E. synapse.
The exchange surfaces of fish gills are arranged as rows of
A. lamellae. B. trachea. C. alveoli. D. parabronchi. E. spiracles.
When a person has an autoimmune disorder, antibodies are secreted that bind to:
What will be an ideal response?
Which of the following activities does not require cellular energy?
A. movement of organelles within cells B. swimming movements of some types of cells C. movement of water across the cell membrane down the concentration gradient D. driving endergonic reactions