Triatoma, commonly called "kissing bugs," are vectors of
A. African sleeping sickness.
B. Chagas' disease.
C. Cyclosporiasis.
D. Leishmania.
E. schistosomiasis.
Answer: B
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Imagine that you have set up a genetic screen to identify E. coli mutants that cannot metabolize the amino acid tryptophan for energy. Beginning with a master plate containing many colonies, you prepare replica plates on medium with glucose or tryptophan as the only energy source. You would look for colonies that _____.
A) cannot grow on either type of media B) can grow on both types of media C) can grow only on the plates with tryptophan D) can grow only on the plates with glucose
Rapid sand filtration, used in many water purification plants, is sufficient to ensure that Giardia will be consistently removed.
Answer the following statement true (T) or false (F)
Zuzu is a white cat. She is genotype Ww for the "white masking gene" that reduces the number of melanocytes (pigment-containing cells). As a result, her body makes pigment, but it cannot get into the cells where it would color the fur. Zuzu's white masking gene is ________ to the melanin pigment gene because it prevents full expression of the pigment.
A) recessive B) pleiotropic C) epistatic D) dominant
What are transgenic organisms? Explain the rationale behind using these organisms to produce some
of the proteins needed for human use, instead of relying solely on proteins produced by genetically engineered E. coli What will be an ideal response?