To make a typical Southern blot, genomic DNA is extracted and cut into fragments and the fragments are separated by ____________________
Fill in the blank(s) with correct word
gel electrophoresis
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Which statement about diversity in eye development is not correct?
A. Planaria have the simplest eyes, which are basically pit-shaped cells containing photoreceptors. B. Evolution of the spherical lens improved images as animals evolved. C. Both squids and vertebrates have singlelens eyes, but they are very different in their development, anatomy, and physiology. D. The percentage of living animals possessing true eyes that can produce an image is small. E. Compound eyes consist of hundreds of small lenses arranged on a convex surface.
The membrane that surrounds the central vacuole is the ____
a. chloroplast
b. tonoplast c. chromoplast d. amyloplast e. ionoplast
A colleague insists on using inexpensive plastic flasks for experiments, which she claims has never been a problem until her most recent carbohydrate hydrolysis tests. After adding enzymes to a solution containing a polymer reactant, she took a short break, then came back to find all of her flasks melted and her experiment ruined. Your colleague suspects sabotage, but you realize immediately that the answer is much simpler. Why did the flasks melt?
a. Plastic is a polymer, and the addition of an enzyme to the carbohydrate solution was sufficient to reduce the plastic flasks into their base monomers. b. Hydrolysis reactions require significant energy input to break polymer bonds; she melted her flasks by leaving them unsupervised over lit Bunsen burners. c. Hydrolysis reactions release energy when polymer bonds are broken. The addition of an enzyme catalyst accelerated the reaction, producing enough waste heat to melt the flasks. d. Carbohydrate solutions are breeding grounds for microorganisms that metabolize plastic; even in a laboratory environment, plenty of microbes would exist to devour the flasks from within.
__________ counters the effects of mutation, natural selection, and genetic drift. Fill in the blank(s) with the appropriate word(s)