Summarize the major advantage of using YACs to carry genome libraries. What will be an ideal response?
ANSWER: If a human genomic library were made using DNA fragments in the size range that plasmids
can carry, about 8 million plasmids would be needed to make sure the library included all the
genetic information from one human cell. Yeast artificial chromosome (YACs) were
developed to carry DNA fragments up to 1 million bases long. A human genomic library can
be carried in just over 3,000 YACs and it is much easier to search through 3,000 clones rather
than 8 million clones in looking for a specific gene
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Which of the following is FALSE about the Casparian strip
A) it is found in stems B) it partially surrounds cells within the endodermis C) it causes water to move into the vascular cylinder D) it is waxy
The failure of chromosomes to separate during anaphase is called __________
A. synapsis B. maternal effect C. epistasis D. nondisjunction
How does a vesicle form from the cell membrane?
What will be an ideal response?
When pollen from one species lands on the stigma of a flower from another species
a. the pollen tube typically does not develop. b. the pollen tube typically forms, but the sperm cannot penetrate the egg. c. the pollen tube typically forms and grows to the ovary, but then stops. d. the pollen tube typically forms, but the sperm are killed. e. the pollen tube typically forms and the egg is usually fertilized, but the embryo rarely grows.