A biologist exposes mice to mutagenizing X rays to generate an array of different mutants. He hopes to generate a mutant form of acetylcholinesterase that will be functional at normal body temperature but inactive at a higher temperature. Which step below would work as an initial screening step in the biologist's quest to eventually identify a mutant of this type?

Look for mice with normal muscle contraction–relaxation activity at normal body temperature that develop continuous muscle contraction during an induced fever.

Look for mice that develop hyperactivity and rapid muscle movements as their body temperature changes from normal to the higher temperature of an induced fever.

Look for mice with a normal response to loud noise that become more easily startled by the same noise stimulus as their body temperature rises during an induced fever.

Look for mice with normal muscle contraction–relaxation activity at normal body temperature that develop an inability to contract muscles during an induced fever.

The correct option is B:

"Look for mice that develop hyperactivity and rapid muscle movements as their body temperature changes from normal to the higher temperature of an induced fever."

Explanation:

The enzyme acetylcholinesterase is responsible for the breakdown of acetylcholine which is a neurotransmitter. Once the enzyme is inactivated at a higher temperature, it will cause acetylcholine to build up in the synapse. This will lead to a continued stimulation of its target receptors that can result in seizures, and hence, this will be the case with the mice who have the mutant form of acetylcholinesterase enzyme.

Hope that answers the question, have a great day!

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: