True or false: it is impossible to override a genetic predisposition to a disease such as skin cancer
A. true
B. false
B
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Viruses variously depend on their host cell for parts of the viral replication and maturation process. Many viruses do however encode for some enzymes that facilitate certain steps or virus-specific processes for viral replication and maturation
Which cellular processes and enzymes do ALL viruses lack and must therefore ALWAYS be supplied by the host cell? What will be an ideal response?
Transcription continues until:
A. all bases in the DNA are copied. B. a stop codon is encountered. C. a terminator sequence is encountered. D. a ribosome pulls RNA polymerase off the DNA. E. a transcription factor signals the end of the gene.
During the preparation of a human genomic library, plasmids containing human DNA fragments are inserted into:a
compatible human cells. b. an antibiotic-resistant strain of E. coli to protect the inserted fragments. c. antibiotic-sensitive E. coli cells that become antibiotic-resistant if transformed. d. bacteriophages. e. mRNA molecules.
Facultative heterochromatin is heterochromatin that contains
a. sequences inactive in one cell type but active in others. b. DNA sequences that are not transcribed in any cell type. c. a mixture of heterochromatin and euchromatin. d. heterochromatin that functions in ways other than for transcription.