Which of the following most correctly describes the whole-genome shotgun technique for sequencing a genome?
A) genetic mapping followed immediately by sequencing
B) physical mapping followed immediately by sequencing
C) cloning large genome fragments into very large vectors such as YACs, followed by sequencing
D) cloning fragments from many copies of an entire chromosome, sequencing the fragments, and then ordering the sequences
E) cloning the whole genome directly, from one end to the other
Answer: D
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Possessing the entire sequence of a particular human genome may not be as useful as we think. Why not?
A. Every human genome is different enough that knowing ONE human's DNA sequence can't tell us almost anything about ALL humans. B. It's not the DNA sequence that matters-we need to know the mRNA sequence of the human genome. C. Due to the presence of introns/exons, and splicing of RNA after transcription, the DNA sequence doesn't necessarily tell us the exact number/type of proteins that will eventually be made from it. D. The amount of "junk DNA" present in the human genome masks any useful genetic information that we'd like to obtain.
Meiosis and unequal cytoplasmic division in seed plant ___ produce three small cells that disintegrate and one large
megaspore.
a. pollen sacs b. pollen grains c. gametophytes d. microspores e. ovules
Decomposers
What will be an ideal response?
Which of the following is an example of a secondary metabolite?
A. Toxin produced by species of Clostridium B. Lactic acid made during yogurt production. C. Alcohol produced by Saccharomyces during fermentation D. All of these are secondary metabolites.