A cause of epiglottitis in children and young adults is
A. Haemophilus influenzae.
B. Haemophilus ducreyi.
C. Haemophilus aegyptius.
D. Haemophilus parainfluenzae.
E. Haemophilus aphrophilus.
Answer: A. Haemophilus influenzae.
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In the Meselson-Stahl experiment, bacterial DNA was labeled completely with heavy nitrogen (15N) and then grown
in the presence of light nitrogen (14N). When only mixed DNA was observed after ONE generation of growth in 14N, what was the conclusion?
a. DNA replication is semiconservative b. DNA replication is conservative c. DNA replication is dispersive d. DNA replication is either semiconservative or dispersive e. DNA replication is either semiconservative or conservative
Please match the types of mutations with the statements that most accurately describe them, to test your understanding of their causes.
Frameshift mutation A) Random change in the DNA arising from errors in replication that occur without a known cause B) Result from exposure to known mutagens, which are primarily physical or chemical agents that damage DNA C) Changing of single base in the DNA code that may result in the placement of a different amino acid D) Addition or deletion of bases that changes the reading of mRNA codons
The fragile cell produced when gram-positive bacteria are exposed to lysozyme or penicillin is a/an
A. protoplast. B. mycoplasma. C. spheroplast. D. glycocalyx. E. glycan.
What is the goal of functional genomics?
A. to determine the purpose of our genes and how they form a human being B. to determine the genome sequence of other organisms useful to humans C. to carry out gene therapy for human diseases D. to determine how all the proteins within the cell interact E. to determine all of the human genome sequence