USA 6 Final

What is the function of proteins found within the cell membrane?

• Facilitate the movement of particles across the cell membrane

• Provide strength and rigidity, allowing the cell to maintain its shape

• Code for specific structures found in the cell membrane

• Create a hydrophobic layer that forms a barrier between the inside and outside of the cell

Tags

TX.112.42.C.5.C.

A model of the cell membrane below shows many different molecules that perform various functions for the cell. Some of these molecules keep the contents inside of the cell separated from the contents outside of the cell. Others allow certain materials to be transported across the membrane. Which molecule separates the contents inside of the cell from the outside of the cell?

• Carbohydrates

• Lipids

• Nucleic acids

• Protein

Tags

TX.112.42.C.5.C.

Many plants have a waxy coating on their surface that helps maintain homeostasis. This coating reduces water loss because it is not water-permeable. Students analyzed the table below to determine which is most similar to the waxy coating on plants. What biomolecule is most similar to the waxy coating on plants?

• Protease

• Phospholipid

• Fibrinogen

• Glucose

Tags

TX.112.42.C.5.C.

TX.112.42.C.5.A.

How do cells use energy to maintain homeostasis? Select TWO correct answers.

• Membrane proteins allow chemicals to move from high concentration to low concentration until equilibrium is reached.

• A cell will form a vesicle around cellular waste and fuse the vesicle with the cell membrane to release the waste into the extracellular environment.

• Cells will break down sugar to synthesize adenosine triphosphate (ATP) from adenosine diphosphate (ADP) and phosphate.

• Cells maintain osmotic balance by taking in water or releasing water to match the water concentration of the extracellular environment.

• Membrane proteins move chemicals from the area of low concentration to the area of high concentration.

Tags

TX.112.42.C.5.C.

Students are discussing cellular transport. Based on their responses, which students made true statements and which made false statements regarding cellular transport?

Amina​ (a)  

Liam ​ (b)  

Sofia ​ (c)  

Yuki ​ (d)  

Kendrick ​ (e)  

• True
• False

Tags

TX.112.42.C.5.C.

When a patient comes to a hospital with severe dehydration, doctors will give them IV

(intravenous) saline, an isotonic saltwater solution injected directly into the

bloodstream. Why is the patient not given pure water?

• Pure water is hypotonic and would cause the blood cells to swell and burst.

• Pure water is hypotonic and would cause the blood cells to shrivel up.

• Pure water is hypertonic and would cause the blood cells to swell and burst.

• Pure water is hypertonic and would cause the blood cells to shrivel up.

Tags

TX.112.42.C.5.C.

Students constructed a diagram to represent two related cellular processes. Organelle A is responsible for capturing light energy and converting it into chemical energy. What is the name of the organelle labeled A? Write your answer in the box.

Tags

TX.112.42.C.11.A.

Students placed yeast cells into a test tube. They added sugar solution to the test tube and placed a rubber stopper on the end. They left the test tube at room temperature to examine after reading about yeast. Students discovered through reading that yeast are single-celled fungi that contain many mitochondria, but chloroplasts are absent. What most likely occurred in the test tube while the students were reading?

• Yeast produced carbon dioxide due to cellular respiration.

• Yeast produced carbon dioxide due to photosynthesis.

• Yeast produced oxygen due to cellular respiration.

• Yeast produced oxygen due to photosynthesis.

Tags

TX.112.42.C.11.A.

Students measured and graphed the activity of enzymes at different temperatures. Which is the most valid conclusion based on this graph?

• Enzymes are not affected by temperature.

• Enzymes work most effectively at low temperatures.

• Raising the temperature always makes an enzyme work better.

• Enzyme function decreases after a certain favorable temperature.

Tags

TX.112.42.C.11.B.

Identify each component of this enzymatic reaction:

a

b

c

d

Substrate

Enzyme

Enzyme-Substrate COmmplex

Product

Tags

TX.112.42.C.11.B.