Choose the One Most Appropriate Answer for Each

question 22

Multiple Choice

Choose the one most appropriate answer for each.
-repressor protein

• A)a condensed X chromosome
• B)protein that combines with DNA all along its length
• C)attaches or detaches from operator to regulate transcription
• D)portion of the operon that binds RNA polymerase
• E)genes that induce expression of other genes
• F)genes controlling the development of the body plan
• G)the mutated form of this gene is associated with breast cancer
• H)binding sites on DNA for regulatory proteins that increase transcription rates

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Definitions:

Capsids

Protein shells that encase the genetic material of a virus, protecting it and aiding in its transmission.

Chromatids

Each of the two thread-like strands into which a chromosome divides longitudinally during cell division. Each contains a double helix of DNA.

Rotating Flagella

Hair-like structures that protrude from the cell body of certain bacterial cells, rotating like propellers to enable movement.

Cilia

Microscopic, hair-like structures that extend from the surface of many animal cells, involved in movement and sensory functions.