Biology Test

Created by pricefam4 

Upgrade to
remove ads

The exoskeleton is composed of thin fiberous elements that form a framework for the cell

Exoskeleton---Cytoskeleton

Controls materials entering and leaving the cell

Cell Membrane

True or False: Cells have a support structure within the cytoplasm called cytoskeleton

True

True or False: A phospholipid has a hydrophobic head attached to a long hydrophilic tail

False

Who was the first scientist to describe living cells as seen through a simple microscope

Anton van Leevwenhoek & Robert Hooke

True or False: The plasma membrane is a bilayer of lipid molecules with protein molecules embedded in it

True

Clear fluid inside the cell

Cytoplasm

Firm, protective structure that gives the cell its shape in plants

Cell Wall

Modifies proteins chemically then repackages them

Golgi Apparatus

What cell structures make plant and animal cells different

Plant- Cell Wall,Chloroplast, Vacuole
Animal- Lysosomes, Flagella, Centrioles

What happens to a higher concentration of disolved molecule on one side of a cell membrane during the process of diffusion

The higher concentration begins to defuse into the area with lower concentration.

What is osmosis

Diffusion of water through a selectively permeable membrane
[HIGH] - [LOW]

True or False: The structure and properties of the cell wall allow it to be selective and maintain homeostasis

False

True or False: The plasma membrane can contain cholesterol, which tends to make the membrane more stable

False

Place the following in order from smallest to largest level of organization
(Tissue, Organ, Organ System, Individual Cells, Organism)

Individual Cell, Tissue, Organ, Organ System, Organism
(Cells make up tissue, tissues make up organs, organs make up organ systems, organ systems make up organisms)

Compare and Contrast endocytosis and exocytosis

Endocytosis-process by which cells absorb molecules (such as proteins) from outside
Exocytosis- Cells direct the contents of secretory visels out the cell membrane

Describe the structure of a phospholipid

Made up of a head and 2 fatty acid tails.
Head- phosphate and glycerol (hydrophilic)
Tail- fatty acid (hydrophobic)

Which end of a phospholipid is attracted to water

head (hydrophilic)

Plants have cells that contain chloroplast. Why must their cells contain mitochondria as well

Chloroplast- makes food by trapping light energy to convert water and carbon dioxide to form oxygen and glucose (photosynthesis)
Mitochondria- provides energy for the cells use by extracting the energy from glucose molecules and storing ATP

How are phospholipids arranged in the plasma membrane

In a dual layer, the tails are facing toward each other. The head i son the outer surface

What is the function of membrane proteins

Transport proteins. Diffusion and active transport

True or False: Transport proteins span the cell membrane allowing the selectively permeable membrane to regulate which molecules enter and leave a cell

False

Providing temporary storage of food, enzymes and waste products

Vacuole

Digest excess or worn out cell parts, food particles, and invading viruses or bacteria

Lysosomes

Folded membranes that serve as the delivery/ transprtaion system of the cell

Endoplasmic Reticulum

What scientist concluded that all plants are made of cells

Mathias Scheden

Organelle that manages all cell functions in eukaryotic cell

nucleus

Sites of protein synthesis

Ribosomes

A green pigment that traps energy from sunlight and gives plants there green color

Chlorophyll

Produce a useable form of energy for the cell

Mitochondria

What is the functions of cholesterol molecules

help membrane maintain homeostasis at very high temperatures. Cholesterol keeps fatty acid tails from touching

True or False: The fluid mosiac model describes the plasma membrane as a structure that is liquid and very rigid

False

What scientist conducted that all animals are composed of cells

Thodore Shwann

True or False: Microtubules of the cytoskeleton are thin, hollow cylinder made of protein

True

Cilla and Flagella are cell surface structures that are adapted for respiration

respirtaion---movement

Flagella are short numeroud hair like projections from the plasma membrane

Flagella---Cilla

What scientist observed that cork was composed of tiny hollow boxes that he called cells

Robert Hooke

What are the 3 parts of the cell theory

1. cells are the smallest unit of life
2. all living organisms are made of cells
3. all cells come from preexisting cells (these are theories)

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set