The Sigma-70 Subunit

question 4

Multiple Choice

The sigma-70 subunit

• A)increases the affinity of the core polymerase for nonpromoter sequences.
• B)decreases the affinity of the core polymerase for specific promoter sequences.
• C)is responsible for transcribing many genes.
• D)is associated with a holoenzyme,enabling the formation of more stable complexes.
• E)All of the above.

---

Definitions:

Neurotransmitter Molecules

Chemical substances in the nervous system that transmit signals across synapses from one neuron to another.

Sending Neuron

A neuron that transmits a nerve impulse away from itself towards another neuron, muscle cell, or gland.

Synapse

The junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron. The tiny gap at this junction is called the synaptic gap or synaptic cleft.

Sending Neuron

The nerve cell that transmits an electrical signal to a receiving neuron across a synapse, facilitating neural communication.