Q: Hair and nails are made of what? Choices: - chromatin - proteins - cellulose - keratin A:
keratin

(Question)
Q: What are broken down during digestion to provide the amino acids needed for protein synthesis? Choices: - sugars - carbohydrates - metabolytes - dietary proteins A:
(Answer)
dietary proteins

Ques: Q: After the blood in the pulmonary capillaries becomes saturated with oxygen, it leaves the lungs and travels where? Choices: - to the lungs - to the kidneys - to the brain - to the heart A:
Ans: to the heart

(Q).
Q: An amide bond joining two amino acid units is called a what? Choices: - carboxyl bond - ammonia bond - precipitate bond - peptide bond A:
(A).
peptide bond

Ques:Q: What type of energy travels through space as electrical and magnetic waves? Choices: - sound energy - mechanical energy - solar energy - electromagnetic energy A:

Ans:electromagnetic energy

Question: Q: In their pure form, all elements have an oxidation number of what? Choices: - 3 - 2 - 7 - zero A:
Answer:
zero