Unit 2 - Concept 2 - cells

Unit 2 - Concept 2 - Cell Transport

by Nancy Sullivan

​Granite Academy

​

​HS - LS1 - 3

​Day 1

​Homeostasis

​Feedback Mechanisms

Multiple Choice

Homeostasis means

• internal balance

• external balance

• unchanging balance

Multiple Choice

Dynamic equilibrium means

• internal balance

• external balance

• changing balance

• unchanging balance

Multiple Choice

A stimulus is a change in the

• organism

• environment

Multiple Choice

A response is a change in the

• organism

• environment

Multiple Choice

Intensifies means

• gets weaker

• gets stronger

Multiple Choice

A POSITIVE feedback loop results in homeostasis.

• True

• False

Multiple Choice

A negative feedback loop results in homeostasis.

• True

• False

Positive or Negative feedback ​loop?

​Remember....

Positive feedback loops lead to continued imbalance and Negative feedback loops lead to a return to balance.

Multiple Choice

The hypothalamus of a human reacts to temperature fluctuations and responds accordingly. If the temperature drops, the body shivers to bring up the temperature and if it is too warm, the body will sweat to cool down due to evaporation. This feedback loop is

• positive

• negative

Multiple Choice

Consider the process of blood clotting. The arrival of platelets at a site releases clotting factors that cause more platelets to arrive at the injury site. This feedabck loop is

• positive

• negative

Multiple Choice

When there isn’t enough rain, plants die off, which limits how much water vapor is added to the air from the planet’s surface. Dry dust is also added to the atmosphere which ends up absorbing water and making the air even dryer. The lower amount of water vapor in the air means that days get hotter and drier, which decreases the chance that clouds will form, which decreases the chance that it will rain. This feedback loop is

• positive

• negative

Multiple Choice

A decrease in oxygen is detected by the kidneys and they secrete erythropoietin. This hormone stimulates the production of red blood cells. This is an example of a  feedback loop that is 

• positive

• negative

Multiple Choice

When blood pressure increases, signals are sent to the brain from the blood vessels. Signals are sent to the heart from the brain, and heart rate slows down, thus helping blood pressure to return to normal. This is an example of a feedback loop that is

• positive

• negative

​Day 2

​The cell membrane

​Cell Transport

​Words to know

Multiple Choice

Homeostasis means

• internal balance

• external balance

• unchanging balance

Multiple Choice

Dynamic equilibrium means

• internal balance

• external balance

• changing balance

• unchanging balance

Multiple Choice

A stimulus is a change in the

• organism

• environment

Multiple Choice

A response is a change in the

• organism

• environment

Multiple Choice

Intensifies means

• gets weaker

• gets stronger

Multiple Choice

A POSITIVE feedback loop results in homeostasis.

• True

• False

Multiple Choice

A negative feedback loop results in homeostasis.

• True

• False

Multiple Choice

Which cells have a cell membrane?

• prokaryotic

• eukaryotic

• all

• none

Multiple Choice

Selectively permeable means

• some things can flow in/out and others can't

• nothing can flow out

• nothing can flow in

• everything can flow in/out

Multiple Choice

Transport in a cell can be classified as

• active

• passive

• active or passive

• none of the above

Multiple Choice

Passive transport requires

• no extra energy

• extra energy

Multiple Choice

In passive transport movement requires

• no ATP

• lots of ATP

• a little ATP

Multiple Choice

In passive transport things move from a

• higher to a lower concentration

• lower to a higher concentration

• the same concentration to the same concentration

Multiple Choice

In a high concentration the molecules are

• far from each other

• close to each other

Multiple Choice

In a low concentration the molecules are

• far from each other

• close to each other

Multiple Choice

In active transport movement requires

• no ATP

• ATP

Multiple Choice

Active transport requires extra energy because it works 

• with the concentration gradient

• against the concentration gradient

Multiple Choice

A solute is

• what does the dissolving

• what is dissolved

• a uniform mixture

Multiple Choice

A solution is

• what does the dissolving

• what is dissolved

• a uniform mixture

Multiple Choice

A solvent is

• what does the dissolving

• what is dissolved

• a uniform mixture

​DAY 3

​Types of Passive and Active Transport