Q: What layered form of carbon is used as a lubricant and in pencils? Choices: - carbonite - copper - lead - graphite A:
graphite

(Question)
Q: What term means that only molecules or ions of a certain size, shape, polarity or charge are capable of passing through the material? Choices: - classic permeation - induced permeation - radiation permeation - selective permeation A:
(Answer)
selective permeation

Ques: Q: What is the most important muscle involved in the process of breathing? Choices: - mouth - chest - trachea - diaphragm A:
Ans: diaphragm

(Q).
Q: The heart is an organ in which system? Choices: - nervous system - immune system - respiratory system - circulatory system A:
(A).
circulatory system

Ques:Q: How many pairs of autosomes are there? Choices: - five - four - Seven - three A:

Ans:three

Ques:Q: Protein digestion begins in the stomach as pepsinogen in gastric juice is converted to pepsin, the enzyme that hydrolyzes this? Choices: - disulfide bridges - hydrogen bonds - ionic bonds - peptide bonds A:

Ans:
peptide bonds