Question 1

The fluid-mosaic model is a model of the cell membrane. It suggests that the membrane is primarily composed of lipids and proteins. Choose the BEST explanation of the function of proteins in the cell membrane.

Accepted Answer

Proteins allow substances to cross the plasma membrane by active transport.

Answer

Proteins package and sort molecules to be sent in vesicles.

Answer

Proteins read messenger RNA to assemble amino acids.

Answer

Proteins provide a hydrophilic head so that water can enter the cell.

Question 2

What would be a possible cause of a cell's inability to make proteins?

Accepted Answer

Many of the cell's ribosomes were destroyed.

Answer

The cell was unable to produce ATP.

Answer

The cell was unable to photosynthesize.

Answer

The cell was unable to divide.

Question 3

Which of the following is a natural polymer containing repeating units known as nucleotides?

Accepted Answer

DNA

Answer

fatty acid

Answer

enzyme

Answer

glucose

Question 4

Which statement best describes the enzyme represented in the graphs?

Accepted Answer

This enzyme works best at a temperature of 35°C and a pH of 8.

Answer

This enzyme works best at a temperature of 10°C and a pH of 5.

Answer

This enzyme works best at a temperature of 55°C and a pH of 11.

Answer

This enzyme works best at a temperature of 45°C and a pH of 10.

Question 5

The diagram shows a beaker of water and molecules of red dye at the beginning of an experiment and the same beaker of water and molecules of red dye after 30 minutes. Which of the following best explains what happened?

Accepted Answer

The molecules of red dye moved by diffusion from a higher concentration to a lower concentration.

Answer

The molecules of water moved by osmosis from an area of higher concentration to an area of lower concentration.

Answer

The molecules of water moved by active transport from an area of lower concentration to an area of higher concentration.

Answer

The molecules of red dye moved by active transport from an area of higher concentration to an area of lower concentration.

Question 6

The diagram below shows the relationship between photosynthesis and cellular respiration and the organelles in which they occur. Which statement describes how photosynthesis and cellular respiration are interrelated?

Accepted Answer

Carbon dioxide and water released by cellular respiration are used in photosynthesis.

Answer

Oxygen is produced during cellular respiration and stored during photosynthesis.

Answer

Glucose is used during cellular respiration to produce food that is broken down during photosynthesis.

Answer

Photosynthesis releases the energy that is stored during the process of cellular respiration.

Question 7

An investigation is set up to study the movement of water through a membrane. The results are shown in the diagram. The beaker with 100% water in it is an isotonic solution. What type of solution is in the beaker that has 80% water and 20% starch in it?

Accepted Answer

hypertonic

Answer

homogeneous

Answer

heterogeneous

Answer

hypotonic

Question 8

A student is studying cell structures and organelles. He wants to create an explanation of how the various organelles interact to meet the cell’s need for proteins while preventing too many proteins from collecting inside the cell. Which of the following would be the BEST explanation for the student to use?

Accepted Answer

The ribosomes that cover the rough endoplasmic reticulum manufacture proteins. These proteins are sent to the Golgi apparatus where they are modified and sorted based on their destinations. Proteins no longer needed by the cell are broken down by lysosomes.

Answer

The ribosomes that cover the rough endoplasmic reticulum manufacture proteins. These proteins are sent to lysosomes where they are modified and sorted based on their destinations. Proteins no longer needed by the cell are broken down by the Golgi apparatus.

Answer

The surface of the smooth endoplasmic reticulum manufactures proteins. These proteins are sent to the Golgi apparatus where they are modified and sorted based on their destinations. Proteins no longer needed by the cell are broken down by lysosomes.

Answer

The ribosomes that cover the Golgi apparatus manufacture proteins. These proteins are sent to the smooth endoplasmic reticulum where they are modified and sorted based on their destinations. Proteins no longer needed by the cell are broken down by lysosomes.

Question 9

The powerhouse of the cell is the

Accepted Answer

mitochondria

Answer

nucleus

Answer

Ribosomes

Answer

Golgi Apparatus

Question 10

There are two types of this organelle in the cell. Which type is the site of protein synthesis?

Accepted Answer

The rough ER

Answer

Golgi Apparatus

Answer

plasma membrane

Answer

The smooth ER

Question 11

Which level of organization includes organisms of the same species?

Accepted Answer

population

Answer

community

Answer

biosphere

Answer

ecosystem

Question 12

Biodiversity is...

Accepted Answer

the variety of life found in a particular habitat, ecosystem, or the world.

Answer

members of the same species living in a particular area

Answer

the living portion of the Earth

Answer

the biotic factors found in a certain area

Question 13

Examples of limiting factors are...

Accepted Answer

lack of resources and disease

Answer

biotic and abiotic factors

Answer

frogs and beavers

Answer

rocks and soil

Question 14

Autotrophs make their own food through the process of photosynthesis. An example of an autotroph is...

Accepted Answer

algae

Answer

a rabbit

Answer

a bear

Answer

deer

Question 15

Which statement is true about how energy flows in an ecosystem?

Accepted Answer

The energy from the sun flows to producers to consumers.

Answer

Heterotrophs get most of the energy.

Answer

Energy levels increase as it reaches the top of the foodchain.

Answer

Energy flows from heterotrophs to autotrophs.

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