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Understanding Life: Science Test Notes from Chapter 2

Explore essential concepts of life science from a 7th-grade perspective, including the role of proteins, nucleic acids, cellular energy, and growth processes. Learn about stimuli, DNA, metabolism, cells, and more in this informative text.

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Understanding Life: Science Test Notes from Chapter 2

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  1. It’s Alive!!! Or Is It? Science Test Notes Chapter 2 7th Grade

  2. It is not true that proteins are the main source of energy for cells. • Living things carry out the chemical activities of life by using energy. • Nucleic acids are not used by cells for energy storage.

  3. All living things grow during parts of their lives. • The subunits of proteins are called nucleotides.

  4. All living things are composed of one or more cells. • The human body is composed of about 70% water.

  5. When a duck dives underwater, its inner eyelids sense the water and cover the duck’s eyes. To the eyelid, water is a stimulus. • The molecule that provides most of the energy for cellular processes is called ATP.

  6. DNA is not a stimulus that living things sense and respond to. • Potato plants store extra sugar as starch. • DNA is a nucleic acid.

  7. Most of the chemical reactions involved in metabolism require water. • All organisms grow and develop. • Sound is not a basic need of most organisms.

  8. All organisms have cells that contain DNA. • Sexual reproduction produces offspring that share traits from both parents. • The smallest functional and structural unit of life is the cell.

  9. The maintenance of stable internal conditions is called homeostasis. • Organisms carry out chemical activities of life by using energy.

  10. DNA is a nucleic acid molecule. • All organisms do not share the ability to taste and smell.

  11. Gravity, sound, and light are all stimuli that living things can sense and respond to. • The hydra reproduces through asexual reproduction.

  12. Take a 2 Minute Break

  13. The major energy-carrying molecule in the cell is ATP.

  14. Phospholipid molecules form much of the cell membrane.

  15. Have a Nice Day

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