A group of organisms at any particular level in a classification system is called a
A) species
B) genus
C) taxon
D) phylum
Ans: C) taxon
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Which of the following best describes Sanger sequencing?
A. By using dideoxynucleotides that don't have a triphosphate group, there is no energy to add it to the growing nucleotide strand and hence it stops replication. B. By using dideoxynucleotides, it stops the addition of another nucleotide after it. This can then be run on a regular gel to determine the sequence. C. By using dideoxynucleotides, it stops the addition of another nucleotide. These are known as chain terminators and have been labeled with a specific probe to allow for detection and hence the sequence. D. By using dideoxynucleotides, you can tell where they have been incorporated by using microarray analysis. E. By using dideoxynucleotides, you can tell where they have been incorporated by the difference in weight.
Mycobacterium tuberculosis
A. lives in the soil. B. can survive for 8 months in fine aerosol particles. C. has a capsule. D. integrates its genome into host cell DNA. E. produces several virulence factor enzymes and an exotoxin.
A penguin's feet are nearly as cold as ice, while the bird's core body temperature is much higher. Which of the following explains this observation?
A. countercurrent heat exchange between warm blood in arteries and cold blood in veins B. countercurrent heat exchange between warm blood in veins and cold blood in arteries C. blood supply to legs shut off by vasoconstriction D. no muscles in the feet of penguins to generate heat E. heat cannot diffuse from body core to feet because feet are too far away
Myofibril contractile subunits, the sarcomeres, are bounded on each end by a disc of protein called the
A. Z line. B. I band. C. H band. D. M line. E. A band.