Cells Review Lesson 2024

Cells - Structure, Functions, and Processes Review

​In the process of diffusion, a substance tends to move from an area of high concentration to an area of low concentration until its concentration becomes equal throughout a space. For example, think about someone opening a bottle of cleaning ammonia in the middle of a room. The ammonia molecules will initially be most concentrated right where the person opened the bottle, with few or no molecules at the edges of the room.

​Osmosis

​In simple words, osmosis is the movement of water from an area of higher concentration to lower concentration through a selectively permeable membrane. A selectively permeable membrane is known as a cell membrane. Osmosis is a simple natural process that occurs all around and inside us, and it's one on which our lives depend. Plants absorb water through osmosis.

Multiple Choice

The diffusion of water through a semipermeable membrane is

• Active transport

• Passive transport

• exocytosis

• osmosis

​The cell membrane:

​

​The cell membrane is capable of receiving and recognizing chemical signals.

​

​​The cell membrane separates cellular contents from the outside environment.

​

​The cell membrane controls the movement of molecules into and out of the cell.

​Lysosomes are important organelles that help break down, or digest, certain materials inside the cell. Lysosomes have a lot of enzymes that are designed to break down molecules such as proteins and sugars. Once they are broken down, these molecules are sent over to be turned into energy by the mitochondria. Lysosomes will also take all of the dead parts and break them down as well as pass them over for digestion. This is how old cell parts are recycled.

Open Ended

Using the information and the diagram from slide #11, identify an organelle that works together with the lysosome to ensure that the cell maintains homeostasis.

Open Ended

​According to researchers, the body replaces itself with a new set of cells every seven years to 10 years. The process for the creation of new cells is called mitosis, where the cell makes a copy of its own DNA (the genetic information that is passed from parents to offspring) and then splits into two new cells. What would happen to the cell if the nucleus was missing?

Multiple Choice

What is the role of the chloroplast in photosynthesis?

• They excrete carbon dioxide as waste.

• They transform light energy.

• They prepare the cell to reproduce.

• They store water energy.

Multiple Choice

The illustration below shows a process performed by a cell to maintain homeostasis.

What is this process?

• Taking in nutrition

• Mitosis

• Getting rid of waste

• cellular respiration

Levels of Organization

Today we are going to look at the different levels of organization and how they build upon one another.

Life is organized into different levels based upon size (from small to large).

Organisms and Cells

• Some organisms are unicellular. This means they are made of only one cell. Ex: bacteria, yeast

• Some organisms are multicellular. This means they are made of many cells. Ex: humans, trees

Multiple Choice

Which of the following is the correct order of organization in living things from most basic (simple) to most complex?

• organism, cell, tissue, organ, organ system

• organ system, organ, tissue, cell, organism

• cell, tissue, organ, organ system, organism

• cell, organ, tissue, organism, organ system

Cell

• The smallest unit of life (building blocks of life)

• Cells are specialized by size and shape for the job they do.

• Example: nerve cell, also called a neuron

Multiple Choice

The basic unit of structure and function of living organisms

• organ

• organ system

• cell

• tissue

• organism

Tissue

• The same type of cells grouped together that are working together to do a specific job.

• Ex: nerve tissue, muscle tissue

Multiple Choice

A group of similar cells that work together to form the same function is called .......

• organ

• cell

• organ system

• organism

• tissue

Multiple Choice

What is the difference between a cell and a tissue?

• cell is basic unit of life; tissue is group of cells that work as one

• cell is group of tissues; tissue is basic unit of life

• cell is basic unit of life; tissue is groups of different cells

• cell is group of organs; tissue is group of different cells

Organ

• A bunch of tissues working together to do a job.

• Ex: brain, heart

Multiple Choice

A structure that is composed of different kinds of tissues

• organ

• cell

• organ system

• organism

• tissue

Organ System

• A bunch of organs working together

• Ex: nervous system, circulatory system, digestive system, etc.

Multiple Choice

A group of organs that work together to perform a major function....

• organ

• cell

• organ system

• organism

• tissue

Organism

• All cells, tissues, organs, and organ systems working together makes an organism.

• Ex: human, animal

Multiple Choice

Any living thing made up of one or more cells....

• organ

• cell

• organ system

• organism

• tissue

Levels of Organization

When we look at the levels of organization, we must remember the order in which they are listed. Cells are the basic units of life, and when cells come together they form tissues, and so on.

Multiple Select

Please choose from the options below, which are levels of organization.

• cells

• organ

• face

• skin

• tissue

Drag and Drop

Tissues are made up of

Placeholder

Drag these tiles and drop them in the correct blank above

Cells

Organs

Organ Systems

Organelles

Tissue

Organisms

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