Life Processes (SI)

Humans need certain substances to make new cells and repair their tissues. Humans acquire these substances by eating nutritious foods. Which of the following characteristics of life do these statements best support?

• Living organisms use matter and energy for their life processes.
• Living organisms must be able to reproduce to promote their species' survival.
• Living organisms regulate their internal environments.
• Living organisms respond to changes in their external environments.
• None

Through the process of cellular respiration, living things release energy from the sugar found in their food to carry out their life processes. The other substances found in the food may be excreted as waste or are most often used for

• building and repairing cell parts.
• inhibiting reproduction.
• promoting mutations.
• storing and eliminating body tissues.
• None

The main purpose of respiration in cells is to produce _______.

• energy
• oxygen
• waste
• water
• None

How do the nutrients that enter our cells compare with the food we eat?

• The food we eat is broken down into individual, microscopic nutrient molecules which enter the cell.
• The nutrients that enter our cells do not come from the food we eat.
• The nutrients that enter our cells are exactly the same as the food we eat, just smaller pieces.
• The nutrients that enter our cells are in the same form as the food we eat.
• None

How do animals get energy from food?

• Molecules from the food react with oxygen and release energy.
• Molecules from the food react with carbon dioxide and release energy.
• Sound vibrations in the body are used to change food into energy.
• Electrical impulses in the body are used to change food into energy.
• None

All living things need energy to perform their life processes. How and where do they get the energy that they need?

• the oxidation of food through the process of cellular respiration
• the absorption of light that radiates from the Moon
• the production of carbon dioxide through the process of photosynthesis
• the fixation of nitrogen gas from the atmosphere
• None

Photosynthesis typically occurs in plant cells. Cellular respiration occurs in

• the cell(s) of all organisms.
• animal cells only.
• the cells of multicellular organisms only.
• plant cells only.
• None

All cells need energy to perform various processes and to make molecules that are necessary to sustain their lives. From where do cells primarily get this energy?

• food
• water
• heat
• mitosis
• None

When a plant generates food through photosynthesis, this food

• can be used immediately or stored for later use.
• is always used as soon as it is converted into a form the plant can use.
• is stored for a short period of time, usually about three weeks.
• can cause the plant to gain excess layers of fat.
• None

Cells obtain the energy and materials they need to grow, divide, and carry on the functions essential to life from _______.

• food
• water
• sunlight
• air
• None