Question

1. which of the following is not a level of biological organization?

a) tissue b) organ
c) atom d) organelle

1. which human body system is responsible for producing hormones?

a) nervous system b) endocrine system
c) digestive system d) muscular system

1. what sugar is found in the backbone of dna?

a) glucose b) fructose
c) deoxyribose d) ribose

1. which of the following is a function of the nervous system?

a) filtering waste b) transmitting electrical signals
c) pumping blood d) producing enzymes

1. which type of rna carries amino acids to the ribosome during protein synthesis?

a) snrna b) trna
c) rrna d) mrna

1. which of the following is a multicellular organism?

a) bacterium b) virus
c) human d) amoeba

1. which level of biological organization comes directly after tissue?

a) organ system b) cell
c) organ d) organism

1. which system is responsible for gas exchange in the human body?

a) respiratory system b) circulatory system
c) immune system d) digestive system

1. which of the following best describes the double helix structure of dna?

a) two antiparallel strands twisted around each other b) a single strand folded into a helix
c) three strands twisted together d) two parallel strands joined by hydrogen bonds

Explanation:

• Question 8: Levels of biological organization include organelle, cell, tissue, organ, organ system, organism. Atom is a chemical level, not a biological organization level.
• Question 9: The endocrine system produces hormones. The nervous system transmits electrical signals, the digestive system processes food, and the muscular system enables movement.
• Question 10: Deoxyribose is the sugar in the backbone of DNA. Glucose is a simple sugar for energy, fructose is in fruits, and ribose is in RNA.
• Question 11: The nervous system transmits electrical signals. Filtering waste is the excretory system, pumping blood is the circulatory system, and producing enzymes is related to the digestive system.
• Question 12: tRNA (transfer RNA) carries amino acids to the ribosome. snRNA is involved in splicing, rRNA is part of the ribosome, and mRNA carries the genetic code.
• Question 13: Humans are multicellular. Bacteria and amoeba are unicellular, and viruses are not considered organisms.
• Question 14: After tissue comes organ. The order is cell → tissue → organ → organ system → organism.
• Question 15: The respiratory system is for gas exchange. The circulatory system transports substances, the immune system defends against pathogens, and the digestive system breaks down food.
• Question 16: DNA's double helix is two antiparallel strands twisted around each other. A single strand is not DNA's structure, three strands is incorrect, and two parallel strands is not the double helix description.

Answer:

1. c) Atom
2. b) Endocrine system
3. c) Deoxyribose
4. b) Transmitting electrical signals
5. b) tRNA
6. c) Human
7. c) Organ
8. a) Respiratory system
9. a) Two antiparallel strands twisted around each other