homeostasis and regulation

Multiple Choice

What type of feedback is shown in the blood clotting model?

• Positive

• Negative

Open Ended

Explain how the changes in Fig. 5.1(b) affect the body temperature. [3]

Multiple Choice

The diagram represents changes that take place within the human body.

The diagram represents

• cellular differentiation

• dynamic equilibrium

• gene interaction

• biological evolution

Multiple Choice

An example of a negative feedback loop is ...

• Blood glucose regulation

• Temperature regulation

• Heart rate regulation

• All of the above

Fill in the Blanks

Examine the different events in the image. What type of feedback mechanism seems to be occurring?

Open Ended

Using the image (upper loop-temperature drops), identify the stimulus, sensor, effector and response.

Multiple Choice

What is the role of the hypothalamus and pituitary gland in osmoregulation when the blood concentration is too high?

• They release more ADH

• They release less ADH

• They hold onto water

• They release water into urine

Multiple Choice

What are catalysts and what role do they play in biological reactions?

• Substances that slow down reactions

• Substances that speed up reactions without being altered

• Substances that are permanently altered

• Substances that make reactions occur that cannot otherwise occur

Multiple Choice

What is the role of feedback inhibition in enzyme regulation?

• It enhances enzyme activity

• It inhibits enzyme synthesis

• It controls the amount of enzyme

• It has no effect on enzymes

Multiple Choice

In passive transport, substances move across the cell membrane ________ the concentration gradient

• AGAINST

• ALONG

• WITH

• BETWEEN

Multiple Choice

 Look at the diagram of a cross-section of a cell membrane below. The cell membrane controls movement of materials into and out of the cell. The following particles are moving from high concentration to low concentration and are using a carrier protein. How would you describe this type of movement across the membrane? 

• simple osmosis
• active transport
• simple diffusion
• facilitated diffusion

Multiple Choice

What role do transport proteins play in facilitated diffusion?

• They act as barriers to molecules

• They help in the diffusion of molecules

• They prevent molecules from passing through

• They only transport small molecules

Open Ended

Is the image below illustrating the diffusion of solute or the osmosis of water? Why?

Fill in the Blanks

Is the image of a plant cell representing a hypertonic, hypotonic, or isotonic solution?

Multiple Choice

This a picture of an animal and plant cell placed in a solution. Describe the solution?

• Isotonic

• Hypotonic

• Hypertonic

Multiple Choice

What will happen to the cell in a hypertonic solution?

• It will swell

• It will remain the same

• It will shrivel

• It will burst

Multiple Choice

What happens to a cell placed in a hypertonic solution?

• The cell swells because water moves into the cell.

• The cell shrinks because water moves out of the cell.

• The cell remains the same size because the water movement is balanced.

• The cell divides due to the external pressure.

Multiple Choice

The movement of materials from an area of low concentration to an area of high concentration would require...

• glucose

• energy (ATP)

• fish

• chips

Fill in the Blanks

This process occurs when large molecules move into the cell. An immune cell eating a bacterium is an example.

Multiple Choice

Which part of the signaling pathway could consist of protein modification, second messenger production, amplification or a phosphorylation cascade?

• Reception

• Transduction

• Response

• All of these

Multiple Choice

what type of feedback does the graph represent

• positive

• negative

• both

• neither

Multiple Choice

The diagram represents changes that take place within the human body.

The diagram represents

• cellular differentiation

• dynamic equilibrium

• gene interaction

• biological evolution

Multiple Choice

This is an example of __________.

• Homeostasis

• Negative Feedback Loop

• Positive Feedback Loop

• Feedback Loop

Multiple Choice

What type of transmembrane receptor is being shown?

• G-protein receptor
• tyrosine kinase receptor
• gated ion channel

Multiple Choice

What determines whether a signal molecule binds on the surface or enters the cell?

• size
• polarity
• ability to cross the membrane
• all of these are correct

Multiple Choice

What is the primary role of receptor proteins in cell signaling?

• To synthesize signal molecules

• To receive and respond to chemical signals

• To produce cellular energy

• To replicate DNA

Multiple Choice

What is an Hormone?

• Substance produced in one part of an organism that affects another part of the organism
• Cells that has an receptor for a particular hormone
• Cells that pick up on a particular hormones through receptor
• Steroids that cause the abnormal actions in hormones

Multiple Choice

What do second messengers do?

• transport a signal through the lipid bilayer
• relay a signal from the outside to the inside of the cell
• relay message from the inside of the mebrane throughout the cytoplasm
• dampen the message