GED Science : Biology and Life Sciences

Study concepts, example questions & explanations for GED Science

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Example Questions

Example Question #31 : Biology And Life Sciences

Cell membranes are selectively permeable—they regulate the flow of materials into and out of the cell via transport.

What is true about active transport?

Possible Answers:

Molecules always move from high to low concentrations.

Only fat-soluble molecules can undergo active transport.

It includes diffusion and osmosis.

Energy is required.

No energy is required.
Correct answer:

Energy is required.

Explanation:

Active transport always requires energy since molecules are being pumped against their concentration gradients by being transported from areas of low concentration to areas of high concentration. Osmosis and diffusion are examples of passive transport and do not require energy.

Example Question #32 : Biology And Life Sciences

If a cell is placed in a hypertonic solution, water will move __________.

Possible Answers:

nowhere, the water will not move at all

out of the cell

into the cell

into the cell membrane

in and out of the cell at the same rate

Correct answer:

out of the cell

Explanation:

In a hypertonic solution, the cell has a greater concentration of water molecules inside it than the solution does. Because of this, the water will move out of the cell in an effort to balance the concentration of water molecules both inside and outside of the cell.

Example Question #1 : Organelles

Which of the following organelles is found in plant cells, but not in animal cells?

Possible Answers:

Chloroplast

Mitochondria

Golgi body

Smooth endoplasmic reticulum

Correct answer:

Chloroplast

Explanation:

One of the primary differences between plant cells and animal cells is that plant cells must be able to undergo photosynthesis. Photosynthesis takes place in the chloroplasts, which contain the pigment chlorophyll. Chloroplasts are not found in animal cells, but are found in plant cells.

Both animal and plant cells contain Golgi bodies, smooth endoplasmic reticulum, and mitochondria.

Example Question #2 : Organelles

Which of the following correctly gives the function of an organelle found within an eukaryotic cell

Possible Answers:

The smooth endoplasmic reticulum is responsible for breaking down of unwanted proteins

The Golgi body provides structural support to the cell

Mitochondria produce vast stores of ATP (energy) for the cell to use

Ribosomes are responsible for disposal and break down of used and unwanted proteins

Lysosomes are responsible for protein synthesis

Correct answer:

Mitochondria produce vast stores of ATP (energy) for the cell to use

Explanation:

Mitochondria are the only organelle defined correctly. The main processes of cell respiration, namely the electron transport chain, occur in the mitochondria to produce energy in the form of ATP. Because of this, mitochondria are known as the "powerhouses" of the cell.

Ribosomes are responsible for transcribing RNA and creating new proteins. The Golgi body packages proteins into vesicles that can be transported out of the cell. Lysosomes contain enzymes that can digest old or damaged proteins. The smooth endoplasmic reticulum is responsible for synthesizing lipids and for degrading toxins, such as alcohol.

Example Question #3 : Organelles

Which RNA-based organelle is the site of protein synthesis within the cell?

Possible Answers:

Mitochondria

Ribosomes

Vacuole

Lysosomes

Nucleus

Correct answer:

Ribosomes

Explanation:

Ribosomes are composed of a unique type of RNA, rRNA, and are located within the cytoplasm of the cell and on the surface of the rough endoplasmic reticulum. Here, proteins are assembled from amino acids piece by piece using instructions copied from DNA.

Example Question #31 : Cells And Life

Where does ATP synthesis occur within the cell? 

Possible Answers:

Nucleus

Mitochondria

Endoplasmic reticulum

Ribosomes

Golgi apparatus

Correct answer:

Mitochondria

Explanation:

The mitochondria are organelles that are often referred to as the "power plant" of the cell. Mitochondria are responsible for extracting energy from food molecules and binding it in the high energy bonds of the ATP molecule.  

Example Question #5 : Organelles

What is the function of the Golgi apparatus within the cell?

Possible Answers:

Transport of materials packaged in vesicles to other parts of the cell or outside the cell membrane

Manufacturing lipids such as steroid hormones

The site of protein synthesis within the cell

Digestion of food and waste products

Synthesis of chemical energy from sunlight

Correct answer:

Transport of materials packaged in vesicles to other parts of the cell or outside the cell membrane

Explanation:

The Golgi apparatus can be thought of as the "shipping center" of the cell. Here, proteins and other materials are packaged in vesicles which are transported to other sites in the cell or outside the cell membrane for "export".  

Example Question #6 : Organelles

Which of the following organelles is not found in animal cells?

Possible Answers:

Mitochondria

Nucleus

Endoplasmic reticulum

Ribosomes

Chloroplast

Correct answer:

Chloroplast

Explanation:

The chloroplast is unique to plant cells (and some bacteria and protists), and is the site of photosynthesis. Almost all energy used by life is captured by this organelle. All other answers listed can be found in both plant and animal cells.  

Example Question #32 : Cells And Life

Which of the following is not a membranous organelle?

Possible Answers:

Ribosomes

Endoplasmic reticulum

Mitochondria

Lysosome

Golgi apparatus

Correct answer:

Ribosomes

Explanation:

Nonmembranous organelles are always in contact with cytosol.

Membranous organelles are surrounded by membranes that isolate their contents from the cytosol.

Ribosomes are freely scattered in the cytoplasm and thus are nonmembranous organelles.

Example Question #7 : Organelles

If a cell lacks endoplasmic reticulum (ER), one direct result will be that it cannot __________.

Possible Answers:

secrete proteins

produce substantial amounts of ATP

reproduce itself

manufacture proteins

store, alter and package secretory products

Correct answer:

secrete proteins

Explanation:

One of the functions of the endoplasmic reticulum is to secrete proteins.

It's other functions include: synthesis of secretory products, intracellular storage, transport, and calcium ion storage.

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