Q: In a model of an atom, the level with the least energy is the one closest to what? Choices: - center - surface - protons - nucleus A:
nucleus

(Question)
Q: How many quarks are in each proton and neutron? Choices: - ten - five - four - three A:
(Answer)
three

Ques: Q: A system in what state cannot spontaneously change, and therefore can do no work? Choices: - equality - balance - stability - equilibrium A:
Ans: equilibrium

(Q).
Q: What kind of process is boiling? Choices: - chemical - spheroidal - cavitation - isothermal A:
(A).
isothermal

Ques:Q: What are single-celled organisms that lack a nucleus called? Choices: - protists - fungi - eukaryotes - prokaryotes A:

Ans:prokaryotes

Q: What are embedded in the membranes of b cells and bind a variety of antigens through their variable regions? Choices: - b.a.p cell receptors - a.m. cell receptors - er cell receptors - b cell receptors A:
b cell receptors