Question

1. the basic unit of life is called a (n)

a) atom b) compound
c) cell d) energy

1. which of the following characteristics of living things best explains why your legs and arms get longer

and stronger as you get older?
a) living things respond to their environment b) living things maintain internal balance
c) living things are made of cells d) living things grow and develop

1. in all of our cells there is dna. which characteristic of life does this fact best describe?

a) living things respond b) living things maintain internal balance
c) living things are based on a universal genetic d) living things grow and develop
code

1. when you step out into the cold, your body shivers in order to keep its temperature at 98.6f.

a) all living things use energy b) all living things contain cells
c) all living things maintain homeostasis d) all living things grow

1. a camel has eyelashes that work to keep the dust and sand out of its eyes.

a) all living things adapt to their environment b) all living things grow
c) all living things have cells d) all living things use energy

1. you are a multi-celled organism but an amoeba is a single celled organism.

a) all living things have cells b) all living things grow
c) all living things use energy d) all living things respond to their environment

1. which of the following is an example of homeostasis?

a) adapting to your environment b) maintaining an appropriate respiration rate
c) the sum of all of your chemical reactions d) being composed of more than one cell

Explanation:

• Question 7: The cell is the basic unit of life. Atoms are the basic units of matter, compounds are substances formed by chemical bonding of atoms, and energy is not a unit of life.
• Question 8: When legs and arms get longer and stronger as one gets older, it shows growth and development. Responding to the environment (e.g., moving away from a threat), maintaining internal balance (homeostasis), and being made of cells are other characteristics but do not directly explain growth in size and strength.
• Question 9: DNA is the universal genetic code. All living things have DNA (or RNA in some viruses) that contains the instructions for their development, functioning, and reproduction. Responding (e.g., to stimuli), maintaining internal balance (homeostasis), and growing/developing are other characteristics but do not relate to the genetic code aspect.
• Question 10: Shivering to keep body temperature at 98.6°F is an example of homeostasis (maintaining a stable internal environment). Using energy (e.g., in metabolism), containing cells (a structural characteristic), and growing (increase in size/number of cells) are different characteristics.
• Question 11: Eyelashes keeping dust and sand out of a camel's eyes is an adaptation to its environment (a sandy environment). Growing (increase in size/number of cells), having cells (a structural characteristic), and using energy (e.g., in metabolism) are not related to this specific trait.
• Question 12: Both a multi - celled organism (like a human) and a single - celled organism (like an amoeba) have cells. Growing (increase in size/number of cells), using energy (e.g., in metabolism), and responding to the environment are different characteristics.
• Question 13: Maintaining an appropriate respiration rate helps in maintaining the balance of gases (like oxygen and carbon dioxide) in the body, which is a part of homeostasis. Adapting to the environment is a different characteristic, the sum of all chemical reactions is metabolism, and being composed of more than one cell is a structural characteristic.

Answer:

• 7. C. cell
• 8. D. living things grow and develop
• 9. C. living things are based on a universal genetic code
• 10. C. All living things maintain homeostasis
• 11. A. All living things adapt to their environment
• 12. A. All living things have cells
• 13. B. maintaining an appropriate respiration rate