Which of the following statements about gel-transfer hybridization (or Southern blotting) is false?
(a) This technique involves the transfer of DNA molecules from gel onto nitrocellulose paper or nylon paper.
(b) In this technique, single-stranded DNA is separated by electrophoresis.
(c) A labeled DNA probe binds to the DNA by hybridization.
(d) The DNA that is separated on a gel is not labeled.
(b) During Southern blotting, double-stranded DNA is loaded onto the agarose gel. The DNA becomes denatured (and thus single-stranded) as it gets transferred by the alkali solution from the gel to the nitrocellulose or nylon sheet.
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Migration of which of the following to different parts of the embryo produces various tissues and organs?
A) the blastocoel B) morula cells C) neural crest cells D) notochord cells E) the animal pole
Which of the following structures allow for gas exchange between the tissues of a leaf and the atmosphere?
A) Cuticle B) Epidermis C) Vascular bundle D) Stomata
Governments establish propulsive industries to promote
A) regional economic development. B) economic growth in existing manufacturing centers. C) primary sector growth. D) local health, education and welfare.
A bell-shaped curve of phenotypic variation is
indicative of
a. environmental effects on phenotypes. b. incomplete dominance. c. multiple alleles. d. epistasis. e. more than one of these.