What is an LCR and what is its role in a chromosomal domain?
What will be an ideal response?
Ans: A locus control region, or LCR, is located at the 5? end of a chromosomal domain and is characterized by multiple hypersensitive sites. It regulates the expression of clusters of genes by forming looped structures.
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Two populations that inhabit the same area but remain genetically distinct can best be called
A. species. B. subspecies (races). C. polymorphic. D. allopatric species. E. sympatric species.
The site of formation of pollen grains is in the
a) receptacle. b) stamen. c) sepal. d) carpel. e) petal.
Salvarsan was a drug to treat syphilis developed by
a) Ehrlich. b) Fleming. c) Weizmann. d) Needham.
Why is organ transplantation challenging?
A) Organs cannot be grown in the laboratory. B) T cells from the immune system attack transplanted tissue. C) Identical twins cannot donate organs to each other by law. D) To harvest a donor's organs, the donor needs to be dead for at least 24 hours.