Which of the following is NOT a member of the globin superfamily?
a. ? globin
b. ? globin
c. myoglobin
d. immunoglobulin
e. leghemoglobin
Ans: d
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Bacterial strains that can produce all the necessary compounds and therefore grow on minimal media are called:
A. auxotrophs. B. omnitrophs. C. prototrophs. D. autotrophs. E. heterotrophs.
In Drosophila embryos, the anterior compartment of a segment overlaps with the posterior compartment of a parasegment
Indicate whether the statement is true or false
A student uses restriction enzymes to cut a DNA molecule into fragments. The digested DNA is loaded into the wells of an agarose gel and the gel is subjected to an electric current. Upon completion of the run, the gel is stained. The type and density of the gel are important because
(A) they influence the rate of migration of the fragments (B) they may cause some DNA molecules to replicate (C) some DNA nucleotides may be lost due to chemical reactions with the gel (D) some DNA molecules may sink to the bottom and not migrate (E) some DNA molecules may cross-link
Can a theory be proved wrong?
A. No, theories are the same as facts. B. No, because there is no good way to test a theory. C. Yes, a new observation or interpretation of data could disprove a theory. D. Yes, theories are the same as hypotheses.