A DNA sequence that signals the start of a gene is
a codon.
an anticodon.
a terminator.
a promoter.
an amino acid attachment site
a promoter
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Horizontal gene transfer in Archaea
A) is infrequent in nature and therefore difficult to use for genetic studies in the laboratory. B) has not been documented, thus all genetic studies of archaea are done via genomic sequencing. C) frequently occurs in nature and has been used to perform genetic studies in the laboratory as well. D) frequently occurs in nature, but there are very few laboratory studies because archaea do not cause human disease.
The procedure in which fertilization takes place in a laboratory dish and the resulting zygote is placed in the woman's uterine tube is called
A) embryo transfer. B) ZIFT. C) RhoGAM. D) GIFT.
In the Hershey and Chase experiment, the pellet was radioactive after bacteria had been infected with
32P-labeled viruses and centrifuged. Why?
a. Bacteria were centrifuged to form the pellet, and they had incorporated radioactive proteins into their DNA. b. Bacteria were centrifuged to form the pellet, and they had incorporated radioactive DNA. c. Viruses were centrifuged to form the pellet, and they had incorporated radioactive proteins from the bacterial DNA. d. Bacteria were centrifuged to form the pellet, and they had incorporated radioactive proteins into their cell membranes. e. Viruses were centrifuged to form the pellet, and they had incorporated radioactive DNA.
Biochemistry is based on the chemistry of which element?
a. hydrogen b. oxygen c. carbon d. sulfur