The nucleolus is the site of:
A. ribosome assembly.
B. uncoiling and unraveling of chromosomes.
C. lipid synthesis.
D. protein synthesis.
E. chromosome replication.
Answer: A
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Balanced polymorphism can be maintained by the combined actions of:
a. the founder effect and genetic drift. b. heterozygote advantage and genetic drift. c. heterozygote advantage and the founder effect. d. frequency-dependent selection and the founder effect. e. heterozygote advantage and frequency-dependent selection
Which of the following best describes processes that take place during cell communication to produce a cellular response?
A) A series of changes takes place in relay molecules through a signal transduction pathway.
B) Local regulators convert electrical signals to chemical signals to cause movement in a cell.
C) Signaling molecules detect changes in a cell's environment and trigger hormone release.
D) Transduction causes signaling molecules to bind to receptors on the surface of a cell.
A(n) ________ is a disease in which antibodies attack specific cells of the body.
Fill in the blank(s) with the appropriate word(s).
Complementation studies can be performed in bacteria by
A) gene targeting. B) forming merodiploids with one copy of a bacterial gene on an F? plasmid. C) forming merodiploids with two copies of a bacterial gene on F? plasmids. D) forming diploids with two copies of the bacterial chromosome.