The popular drug Ecstasy is related to
1.heroin.
2.cocaine.
3.codeine.
4.amphetamine.
5.serotonin.
4
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If a dimorphic fungus is causing a respiratory infection, which of the following might be seen in a sputum specimen from that patient?
A) amebae B) conidia C) hyphae D) yeasts
Why is starch easily digestible by most animals but cellulose is not?
What will be an ideal response?
One of the primary reasons for generating a large number of clones in a eukaryotic genomic library is that ________
A) lysogenic phages continue to integrate their DNA into the host chromosome, thus reducing the number of desired recombinant clones B) each cosmid replicates in coordination with the host chromosome C) the host range of the vector is limited D) each ligation product is sequence specific E) each vector can take up only a relatively small fraction of the eukaryotic DNA
The average mutation rate for DNA replication is 1 mutation for every 10 billion (10,000,000,000 ) nucleotides of DNA replicated. Yet DNA polymerase makes a mistake during replication at an average of 1 in 100,000 nucleotides. What does this say about
DNA replication? A) The base-pairing rules (A pairs with T and G pairs with C) prevent any mutations. B) Cells are extraordinarily proficient at repairing errors made during DNA replication. C) Most errors in DNA replication become mutations. D) Cells recognize that a small fraction of mutations are beneficial to organisms and do not repair those.