Acyclovir is an antiviral chemical that resembles a nucleotide but lacks a 3' OH group and cannot form phosphodiester bonds. Why is acyclovir useful in treating some viral infections?
A. Acyclovir blocks the assembly of viral cell capsules.
B. Acyclovir halts viral DNA replication.
C. Acyclovir hydrolyzes viral polysaccharides.
D. Acyclovir stops viral protein synthesis.
Answer: B
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If the cilia on Bob's inner ear hair cells are damaged, what can be done to improve Bob’s hearing, other than a hearing aid?
Hair cells are delicate sensors of sound, movement, and gravity. Since they are stimulated by movement of the stereocilia and kinocilium, these structures are vulnerable to damage when stimulus is too strong or sustained. A. transgenic expression of a cilia protein B. minoxidil treatment C. injection of microtubules into the cochlea D. not much – there is currently no drug that can regenerate hair cells
The human genome has _______ chromosomes.
a. 46 b. 64 c. 42 d. 23
Photosynthetic organisms are essential for limiting the damage done by global warming because they
____.
a. move carbon from the atmosphere to living organisms b. move carbon from the soil to the atmosphere c. move carbon from the atmosphere to the soil d. produce oxygen e. sequester carbon in geologic sediments
People tend to crave sweet and salty foods, but dislike bitter foods. What is the evolutionary explanation for this? What will be an ideal response?