Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of microtubules, its effectiveness must be related to _____
A) disruption of mitotic spindle formation
B) inhibition of regulatory protein phosphorylation
C) suppression of cyclin production
D) myosin denaturation and inhibition of cleavage furrow formation
E) inhibition of DNA synthesis
Answer: A
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Duchenne muscular dystrophy
a. is an X-linked recessive disorder. b. affects about one in 3,500 boys. c. inevitably results in death by age 25. d. results from an abnormal structural protein in muscle cells. e. fits all of these descriptions.
Recombination between homologous segments on the same chromosome (i.e., linked) would generate
a. a number of tandem duplications. b. a single displaced duplication. c. two recombinant sequences but no duplications or deletions. d. both a duplication and a deletion. e. a large deletion.
An organism can fit into only one nutritional pattern, such as photoheterotrophy, and cannot change if the environmental conditions change.
Answer the following statement true (T) or false (F)
Honeybees have an incredible ability to distinguish thousands of different odorant molecules, using their large repertoire of olfactory receptors. A wide variety of different types of chemicals can be detected as odorants; they simply require olfactory neurons with a receptor that can bind the chemical and transduce that stimulus into a receptor potential.Honeybees can detect a variety of odorants through olfactory receptors on their antennae. You genetically engineer a receptor to be gated by the explosive chemical TNT and use a transgene to express the receptor in honeybee olfactory neurons. What would this provide to the bee?
A. The ability to see TNT B. It would have no effect C. The ability to smell TNT D. The ability to collect TNT molecules E. The ability to taste TNT