Science 11/18/18

Which statement below best describes the shape of a ligand and the receptor it binds?

A ligand has a specific shape that complements the receptor it binds.

How could you tell an animal cell from a plant cell?

A plant cell has a cell wall, chloroplasts and a large central vacuole. An animal cell does not have a cell wall nor chloroplasts. An animal cell has small vacuoles.

A student observes a cell under a microscope. It appears to be a unicellular organism. It has cilia, a nucleus and chloroplasts. What type of cell is the student observing? Explain.

A protist. It must be eukaryotic since it has a nucleus. It has chloroplasts so it must be a plant cell or protisits. Since it has cilia, it is a protisits because plant cells don't have cilia.

What is the difference between a unicellular organism and a multicellular organism?

A unicellular organism is made of one cell. A multicellular organism is made of two or more cells.

Compare and contrast how unicellular organisms obtain oxygen to how a multicellular organism, like a human, obtains oxygen?

A unicellular organism obtains oxygen that diffuses across its membrane. A multicellular organism uses the respiratory system (lungs) to obtain oxygen from the environment.

Which of the following is NOT one of the tenets of the Cell Theory?

Cells contain tiny organisms within them.

Transmembrane proteins can form:

Channels, Pumps, and Receptors

Which structure is a plant cell enables it to make its own food?

Chloroplasts

Which structure found in the cell membrane often acts as an antigen?

Glycoprotein

Which organelle is important to sorting and packaging substances in the cell into vesicles?

Golgi Bodies

Which organelle is important to making energy in a cell?

Mitochondria

Complete the statement. In general, unicellular organisms use _________ to perform life function and multi cellular organisms use __________ to perform life functions.

Organelles, Organ Systems

What is the main component of a cell membrane?

Phospholipids

Below is a membrane receptor. Draw a picture of a ligand that would most likely fit into the receptor.

Picture of a Triangle

Which type of cell always has a cell wall?

Plant Cell

Which type of cells do NOT contain a nucleus?

Prokaryotes

Which type of cell can have a flagellum or cilia?

Protist and Animal Cell

What structure is found in BOTH prokaryotes and eukaryotes?

Ribosomes

What is the difference between rough endoplasmic reticulum and smooth endoplasmic reticulum?

Rough ER has ribosomes attached to it. Smooth ER does not. Rough ER makes proteins. Smooth ER makes lipids.

What is NOT a function of a cell membrane?

The cell membrane controls expression of DNA in the cell.

Which is the function of ribosomes?

To make proteins