The Cell

Luis is making a chart of compounds found in the human body. Which of these is the most important compound found in the human body?

• water

• salt

• carbon dioxide

• sodium bicarbonate

During an experiment, India examines prepared slides that her teacher has given her. One of the slides shows a single-celled organism that lives in soil. It has a nucleus and several internal structures. To which domain does the organism likely belong?

• Archaea

• Bacteria

• Eukarya

• Protista

Even when it is cold outside, the human body maintains an internal temperature of 37 °C. Which term describes the maintenance of a stable internal condition?

• A. endocytosis

• B. homeostasis

• C. mitosis

• D. photosynthesis

When you eat an apple, you are eating a type of tissue that stores nutrients in plants. Which type of tissue stores nutrients in plants?

• connective tissue

• ground tissue

• protective tissue

• transport tissue

Under a high-powered microscope, Dan sees a cellular organelle. The organelle has a double membrane, and the inner membrane is folded. The organelle contains its own DNA. Which organelle does Dan see?

• endoplasmic reticulum

• mitochondrion

• nucleus

• ribosome

What organelle in plant cells makes it possible for plants to carry out photosynthesis?

• A. cell wall

• B. chloroplast

• C. lysosome

• D. nucleus

Amino acids combine to form one of the main molecules found in cells of living things. Which type of molecule is made of amino acids?

• A. lipids

• B. proteins

• C. nucleic acids

• D. carbohydrates

Jorge looks through a microscope and concludes that the cells he observes are eukaryotic cells. Which of the following structures did Jorge most likely observe before making his conclusion?

• nucleus

• cytoplasm

• cell membrane

• genetic material

Emily knows that an organism must be able to perform all the functions necessary for life. Which of the following is an organism?

• DNA

• nucleus

• cytoplasm

• prokaryote

What additional question would be best for Katya to add to her list about classification?

• How are living things related?

• How do living things get energy?

• What do living things need to survive?

• Where do living things make their home?