Q: What is it called when breaks in bone occur that is usually caused by excessive stress on the bone? Choices: - fragments - faults - ruptures - fractures A:
fractures

Q: What essential molecules can be harmful if ingested in large amounts, especially if they contain saturated fatty acids from animal foods? Choices: - oxygen - helium - hydrogen - lipids A:
lipids

Q: Q: Maintaining a high metabolic rate takes a lot of what? Choices: - fuel - hydrogen - power - energy A:
A: energy

Question: Q: What rigid layer surrounds the cell membrane of a plant cell? Choices: - bark - epidermis - cuticle - cell wall A:
Answer: cell wall

*Question*
Q: What is composed of two strands of nucleotides in a double-helical structure? Choices: - molecule - RNA - bacteria - dna A:
**Answer**
dna

*Question*
Q: What is mass number? Choices: - to total number of electrons and neutrons in a nucleus - to total number of protons and electrons in a nucleus - the total number of protons and chondrichthyes in a nucleus - the total number of protons and neutrons in a nucleus A:
**Answer**
the total number of protons and neutrons in a nucleus