1. which characteristic is shared by all living organisms?
a. ability to move from place to place
b. ability to perform photosynthesis
c. ability to reproduce
d. ability to think
2. which level of biological organization is made up of similar cells working together?
a. organ
b. tissue
c. organ system
d. organism
3. which molecule is the main source of quick energy for cells?
a. lipids
b. proteins
c. carbohydrates
d. nucleic acids
4. which macromolecule stores genetic information (dna)?
a. lipid
b. protein
c. carbohydrate
d. nucleic acid
5. enzymes....
a. speed up chemical reactions
b. are products of chemical reactions
c. stop chemical reactions
d. are carbohydrates
6. what happens to an enzyme after a reaction is complete?
a. it is destroyed
b. it becomes part of the product
c. it can be reused

Question

1. which characteristic is shared by all living organisms?
  a. ability to move from place to place
  b. ability to perform photosynthesis
  c. ability to reproduce
  d. ability to think
2. which level of biological organization is made up of similar cells working together?
  a. organ
  b. tissue
  c. organ system
  d. organism
3. which molecule is the main source of quick energy for cells?
  a. lipids
  b. proteins
  c. carbohydrates
  d. nucleic acids
4. which macromolecule stores genetic information (dna)?
  a. lipid
  b. protein
  c. carbohydrate
  d. nucleic acid
5. enzymes....
  a. speed up chemical reactions
  b. are products of chemical reactions
  c. stop chemical reactions
  d. are carbohydrates
6. what happens to an enzyme after a reaction is complete?
  a. it is destroyed
  b. it becomes part of the product
  c. it can be reused

Accepted Answer

### Question 1
# Brief Explanations:
- Option A: Not all living organisms can move from place to place (e.g., plants are stationary).
- Option B: Only autotrophs (like plants) perform photosynthesis; heterotrophs do not.
- Option C: Reproduction (either sexually or asexually) is a fundamental characteristic of all living organisms to ensure the continuation of their species.
- Option D: Only organisms with complex nervous systems (like humans) can "think"; many organisms (e.g., bacteria) do not have this ability.
# Answer: C. Ability to reproduce

### Question 2
# Brief Explanations:
- Option A: An organ is made of different tissues working together.
- Option B: Tissue is defined as a group of similar cells that work together to perform a specific function.
- Option C: An organ system is a group of organs working together.
- Option D: An organism is a complete living entity made of organ systems (or simpler structures in single - celled organisms).
# Answer: B. Tissue

### Question 3
# Brief Explanations:
- Option A: Lipids are long - term energy storage molecules and are not the main source of quick energy.
- Option B: Proteins are mainly for structural support, enzyme activity, etc., and not the main quick energy source.
- Option C: Carbohydrates, especially glucose, are broken down quickly in cells to release energy (via cellular respiration), making them the main source of quick energy.
- Option D: Nucleic acids store genetic information and are not an energy source.
# Answer: C. Carbohydrates

### Question 4
# Brief Explanations:
- Option A: Lipids are for energy storage and cell membrane structure, not genetic information storage.
- Option B: Proteins have structural and functional roles (enzymes, antibodies, etc.) but do not store genetic information.
- Option C: Carbohydrates are for energy, not genetic information storage.
- Option D: Nucleic acids (DNA and RNA) are responsible for storing and transmitting genetic information. DNA is the macromolecule that stores genetic information in most organisms.
# Answer: D. Nucleic acid

### Question 5
# Brief Explanations:
- Option A: Enzymes are biological catalysts that lower the activation energy of chemical reactions, thus speeding them up.
- Option B: Enzymes are not products of chemical reactions in the context of their catalytic role; they facilitate reactions.
- Option C: Enzymes speed up, not stop, chemical reactions.
- Option D: Enzymes are proteins (or in some cases RNA), not carbohydrates.
# Answer: A. speed up chemical reactions

### Question 6
# Brief Explanations:
- Option A: Enzymes are not destroyed during a reaction. They are reusable.
- Option B: Enzymes do not become part of the product. They bind to substrates, facilitate the reaction, and then release the products.
- Option C: Enzymes are not consumed in the reaction and can be reused to catalyze more of the same reaction (or other reactions if they are not specific to one substrate).
# Answer: C. It can be reused

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