Life Science

Which of these is the smallest unit of living things?

• Cells

• Atoms

• Molecules

• Compounds

Answer explanation

Cell is the basic unit of life

Which is the correct sequence of organization in a multi-cellular organism?

• Cell →tissue →organ system → organ

• Organ system → cell →tissue→organ

• Tissue →cell →organ→organ system

• Cell →tissue→organ→organ system

What term describes 2 or more tissues that work together to perform a specific job?

• cell

• organism

• organ

• system

Which is NOT a principal of cell theory?

• All living things are made of one or more cells.

• All cells are exactly the same.

• All new cells come from preexisting cells.

• The cell is the smallest unit of life.

Which statement best explains how cells coming from other cells applies to all organisms?

• The cells of all organisms excrete waste.

• The cells of all organisms have cytoplasm

• The cells of all organisms divide to make more cells

• Cells of all organisms take in nutrients from the environment

Kayla summarizes the cell theory to her class. She states that all organisms are made up of one or more cells. Which pair of statements correctly completes her summary?

• All cells come from existing cells, and all cells have the same parts

• All cells are the same size, and the cell is the basic unit of all organisms

• The cell is the basic unit of all organisms, and all cells have the same parts

• The cell is the basic unit of all organisms, and all cells come from existing cells

Answer explanation

scientific theory of cells (cell theory):

1. all organisms are composed of cells (single-celled or multi-cellular)

2. all cells come from preexisting cells

3. cells are the basic unit of life

Which organelle contains the DNA of the cell?

• cytoplasm

• nucleus

• vacuole

• cell membrane

Which organelles are only found in plants?

• cell membrane and cell wall

• cell wall and mitochondria

• cell wall and choloroplast

• cell membrane and chloroplast

Where does cellular respiration occur in the cell?

• Mitochondria

• Nucleus

• Chloroplasts

• Vacuoles

Answer explanation

Cellular Respiration is used to make ATP energy cells need to function. Mitochondria is considered the 'Power House' of the cell because it's where energy is produced.

What are the three functions of the system shown above?

• removal of pathogens, blood transportation, and movement

• support, protection, and movement

• gas exchange, digestion, and development

• waste removal, regulation, and stimuli response

Answer explanation

This represents the skeletal system