Temporal gene regulation refers to which of the following circumstances?
a. Certain genes are induced only at a particular point in the life cycle.
b. Certain genes are induced only in specific tissues.
c. Heat-shock genes are induced during periods of temperature stress.
d. "Housekeeping" genes are induced in response to a viral infection.
e. Molecular chaperones are synthesized after heavy-metal ingestion
A
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The process of 'crossing over':
a. generally results in binary fission b. involves nucleoli c. involves breakages and exchanges being made between sister chromatids d. involves breakages and exchanges being made between homologous chromosomes e. involves random assortment of homologues during metaphase
Answer the following statements true (T) or false (F)
1. In the bacterium E. coli, in the absence of lactose, a repressor protein binds to the operator region of the DNA, preventing the transcription of the genes of the lactose operon. 2. In eukaryotic cells, gene expression may be controlled by not allowing mRNA to leave the nucleus. 3. A somatic mutation is a mutation that occurs in cells that give rise to gametes. 4. A bacteriophage infects a bacterial cell by injecting nucleic acid into the bacterium. 5. The components of DNA that produce an organism's genetic information are the deoxyribose nucleotides.
In producing an E. coli plasmid to be an expression vector, an experimenter includes genes for selectable markers and a promoter for the expression of the introduced genes. She uses a cDNA sequence to ensure the insert contains no introns
The gene inserted is transcribed, but not translated. What sequence did she omit from the plasmid?
The domain Archaea includes prokaryotes that are
A) endospore formers. B) intracellular parasites. C) members of the deeply branching bacteria. D) human pathogens. E) hyperthermophiles.