Unicellular
Which of the following statements best describes unicellular organisms?
A. Unicellular organisms have transport systems between cells.
B. Unicellular organisms have many cells that must work together to perform life processes.
C. Unicellular organisms are a single cell that performs all life processes.
D. Unicellular organisms live only inside other living organisms.
C. Unicellular organisms are a single cell that performs all life processes.
Why have multicellular organisms developed transport systems?
A. Cells within a multicellular organism are too small for a direct exchange of substances.
B. Cells within a multicellular organism are too far away from the environment for a direct exchange of substances.
C. Cells within a multicellular organism are too large for a direct exchange of substances.
D. Multicellular organisms have not developed transport systems.
B. Cells within a multicellular organism are too far away from the environment for a direct exchange of substances.
Which characteristics do single-celled organisms and multicellular organisms have in common?
A. Both have cells with specialized functions for each life process.
B. Both perform all life processes within one cell.
C. Both have a function to get rid of waste materials.
D. Both are able to make food from sunlight.
C. Both have a function to get rid of waste materials.
Which system functions to transport messages between the brain and other parts of the body?
A. respiratory system
B. nervous system
C. digestive system
D. skeletal system
B. nervous system
Which statement best describes a unicellular organism?
A. It consists of one cell and performs all functions necessary for life within that one cell.
B. It contains more than one cell that performs all functions necessary for life.
C. It is part of a larger organism, such as a human being.
D. It contains differentiated cells that perform all functions necessary for life.
A. It consists of one cell and performs all functions necessary for life within that one cell.
Which of the following is an example of a multicellular organism?
A. human
B. flower
C. fish
D. all of the above
D. all of the above
Which of the following structures function (work together) to provide protection to the heart and lungs?
A. stomach
B. nerves
C. brain
D. bones
D. bones
Which two body systems function (work together) to help a person walk, run, jump, and swim?
A. digestive and muscular systems
B. circulatory and respiratory systems
C. nervous and digestive systems
D. skeletal and muscular systems
D. skeletal and muscular systems
Which of the following is an example of a unicellular organism?
A. Dog
B. Human
C. Amoeba
D. Tree
C) Amoeba
Leo is observing a sample of pond water using a microscope. He sees an organism moving around in the water and thinks it might be a multicellular organism. Which of the following characteristics of the organism make it most likely to be a multicellular organism?
A. The organism is made of many cells.
B. The organism has cells that perform specialized functions necessary for life.
C. The organism has developed transport systems.
D. All of the above.
D. All of the above.
Which human body system functions to break food down into substances the body can absorb and use?
A. digestive system
B. muscular system
C. respiratory system
D. cardiovascular system
A. digestive system
What is the function of the cardiovascular system?
A. To provide protection to the body’s organs
B. To transport needed substances throughout the body and carry away wastes
C. To provide movement to body parts
D. To break food down into substances the body can use
B. To transport needed substances throughout the body and carry away wastes
Where can unicellular organisms live?
A. Only in the ocean
B. Only in warm places
C. In many different environments
D. Only in soil
C. In many different environments
What do the cells in multicellular organisms do?
A. Each cell works alone to survive
B. Different cells perform different jobs that help the organism stay alive
C. Cells only perform the same job
D. Cells do not work together
B. Different cells perform different jobs that help the organism stay alive
Which body system is made up of the following structures: mouth, esophagus, stomach, and intestines?
A. digestive system
B. muscular system
C. respiratory system
D. cardiovascular system
A. digestive system
Which system functions to take oxygen into the body and release carbon dioxide from the body?
A. nervous system
B. digestive system
C. respiratory system
D. skeletal system
C. respiratory system
Which of the following is NOT a unicellular organism?
A. Bacteria
B. Paramecium
C. Mushroom
D. Yeast
C. Mushroom
What is the purpose of tissues in multicellular organisms?
A. To make the organism move
B. To carry out different functions such as support, movement, and protection
C. To store energy for later use
B. To carry out different functions such as support, movement, and protection
Which example best shows the structures that make up the respiratory system of the human body?
A. brain, spinal cord, nerves
B. nose, trachea, lungs
C. heart, blood, vessels
D. esophagus, stomach, intestines
B. nose, trachea, lungs
What is the function of the heart in the circulatory system?
A. It pumps blood through vessels throughout the body.
B. It helps the body make more blood cells.
C. It forms a network of vessels throughout the body.
D. It protects the bones of the skeletal system.
A. It pumps blood through vessels throughout the body.