The Number of Protons Plus the Number of Neutrons Equals

question 101

Multiple Choice

The number of protons plus the number of neutrons equals

• A) the atomic number.
• B) the atomic mass.
• C) the number of electrons.
• D) the number of bonds the atom can form.
• E) the electrical charge of the atom.

---

Definitions:

Repressor

A protein that binds to specific DNA sequences, preventing or reducing the transcription of certain genes.

Allosteric Site

A region on an enzyme that is distinct from the active site and can bind regulatory molecules to change the enzyme's activity.

cAMP

Cyclic adenosine monophosphate, a second messenger important in many biological processes.

Lac Operon

A gene regulatory system found in bacteria and some other organisms that regulates the metabolism of lactose, involving an operon required for the transport and metabolism of lactose.