Ribosomes are made up of:
A. only RNA molecules.
B. only DNA molecules.
C. DNA and RNA.
D. protein and RNA.
E. only protein molecules.
D. protein and RNA.
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Which of the following types of anthrax occurs after ingesting the spores and affects the abdominal or oropharyngeal area? (Patients usually die from toxemia and overwhelming sepsis.)
a. Cutaneous b. Inhalation c. Gastrointestinal d. Bubonic
Transfer RNA differs from other types of RNA
because it a. transfers genetic instructions from cell nucleus to cytoplasm. b. specifies the amino acid sequence of a particular protein. c. carries an amino acid at one end. d. contains codons. e. does none of these.
The largest and strongest males develop a
harem. b. A female bird will mate only with males that perform the best courtship displays. c. Members of a sorority usually marry fraternity brothers. d. Some males mate with any female they encounter. e. Female birds of paradise select the most colorful males as mates.
A molecular biologist is interested in purifying a recombinant protein by His-tagging, but the protein and vector both lack histidine residues. In this case, the molecular biologist could use which of the following technique(s) to achieve purification?
A. Add a 6xHis-tag to the C-terminus of the protein B. Amplify the histidine-encoding sequence by PCR and add it to the gene of interest C. Add a series of histidine residues to the N-terminus of the protein D. All of the choices are correct.