Gregor Mendel ____
a. discovered the structure of DNA
b. claimed that each individual carries a pair of "factors" for a given trait
c. demonstrated that traits carried by parents are "blended" in their offspring
d. cross-bred thirty different species of pea plants over a span of fifty years
e. reasoned that each parent carries one gene for a specific trait
b
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When we say that DNA replication is semiconservative, we mean that:
A. only half of an organism's DNA is replicated during each cell division. B. when DNA is replicated, each new double helix contains one parental strand and one newly synthesized daughter strand. C. when DNA is replicated, one double helix contains both parental strands and one contains two newly synthesized daughter strands. D. parental DNA stays in the parent cell and daughter DNA ends up in the daughter cell. E. None of the answer options are correct.
Day length is sensed by the flower buds of a plant, not their leaves
A. true B. false
The correct sequence of reagents in the Gram stain technique is
a. iodine, alcohol, safranin, crystal violet. b. safranin, crystal violet, alcohol, iodine. c. crystal violet, iodine, alcohol, safranin. d. crystal violet, alcohol, iodine, safranin. e. alcohol, iodine, crystal violet, safranin.
Many plants wind up with a Na+ concentration that is considerably lower than that of the surrounding soil. What plays a key role in allowing for such a difference to exist?
a. endodermis b. tonoplast c. aquaporin d. water potential