The primary structure of a protein is the ____________________ in a polypeptide chain Fill in the blank(s) with the appropriate word(s)
ANSWER: amino acid sequence
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Dr. John Doe, a research microbiologist for a university medical center, has been accused of sending Bacillus anthracis, the causative agent of anthrax, through the mail to the President. You, as a public health official with the CDC, have to determine if it is the same strain as the two strains of B. anthracis found cultured in his lab. Which method of identification would you use to compare these three bacterial samples?
A. Pulse-field gel electrophoresis B. Biochemical test identification C. Serological testing using agglutination D. Gram staining
The four defining characteristics of chordates are
A. pharyngeal pouches, a dorsal nerve cord, a notochord, and a postanal tail. B. bilateral symmetry, segmentation, a well-developed coelom, and limbs. C. a dorsal hollow nerve cord, a notochord, bilateral symmetry, and mammary glands. D. a well-developed coelom, pharyngeal pouches, a notochord, and jaws. E. segmentation, a dorsal hollow nerve cord, pharyngeal pouches, and an amniotic egg.
Some viruses are said to be naked because
A. They have a bilipid membrane instead of the capsid layer B. They have no bilipid membrane C. They have no capsid proteins D. The do not have cell wall E. None of the above
Which of the following is true about dynamic instability of a microtubule end?
A. Each end of a microtubule undergoes dynamic instability at the same time in a cell. B. GDP in the tubulin dimers at the plus end is phosphorylated to become GTP. C. The presence of GDP-tubulin at the plus end of the microtubule causes depolymerization. D. During a growth phase, GTP in the tubulin dimer is hydrolyzed as soon as the dimer is incornorated into the microtubule