How do hair cells of the cochlea translate vibration into nervous impulses?
A) Moving cilia break molecules at their bases.
B) Pulling hairs trigger an action potential.
C) Vibrating hairs open voltage sensitive channels.
D) Bending cilia lead to ion flow and neurotransmitter release.
Answer: D
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The tight packing of chromatin into the chromosomes visible during nuclear division is possible due to links between
____ proteins.
a. Cdk b. H1 histone c. H3 histone d. H4 histone e. nonhistone
Herbivory benefits _____
a. the herbivore c. both the herbivore and the plant b. the plant d. neither the herbivore nor the plant
Major histocompatibility antigens are
A) antigens that provoke allergic reactions. B) antigens that must be processed to be recognized by the immune system. C) antigens attached to foreign invaders. D) autoantigens involved in epitope recognition. E) not really antigens, but rather antibodies produced to mask foreign antigens.
In which of the following environments would you expect to find a high number of iron-reducing bacteria?
A) acidic mine drainage B) deep subsurface C) open ocean D) agriculture soil