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In a hypertonic solution, water flows through aquaporins embedded in the plasma membrane of the cell. This type of transport is best known as which of the following?

A. Osmosis

B. Diffusion

C. Facilitated diffusion

D. Active transport

Answer Explanation:

One of the ways that cells regulate their water balance is by adjusting to different solute concentrations in their environment. When a cell is placed in a solution that has a higher concentration of solutes than the cell itself, the solution is called hypertonic. In this case, water will tend to move out of the cell through special channels called aquaporins, which are embedded in the plasma membrane. This movement of water across a selectively permeable membrane is a type of passive transport called osmosis. Osmosis does not require any energy input from the cell, unlike other forms of transport such as diffusion, facilitated diffusion, or active transport. 

 

Therefore, the Correct Answer is A.

More Questions on TEAS 7 Science

  • Q #1: In a hypertonic solution, water flows through aquaporins embedded in the plasma membrane of the cell. This type of transport is best known as which of the following?

    A. Osmosis

    B. Diffusion

    C. Facilitated diffusion

    D. Active transport

    Answer Explanation

    One of the ways that cells regulate their water balance is by adjusting to different solute concentrations in their environment. When a cell is placed in a solution that has a higher concentration of solutes than the cell itself, the solution is called hypertonic. In this case, water will tend to move out of the cell through special channels called aquaporins, which are embedded in the plasma membrane. This movement of water across a selectively permeable membrane is a type of passive transport called osmosis. Osmosis does not require any energy input from the cell, unlike other forms of transport such as diffusion, facilitated diffusion, or active transport. 

     

  • Q #2: Which of the following microorganisms lack their own metabolic pathways and can only reproduce inside of a host cell?

    A. Viruses

    B. Bacteria

    C. Helminths

    D. Protozoa

    Answer Explanation

    Among the four types of microorganisms listed, only viruses lack their own metabolic pathways and can only reproduce inside of a host cell. Viruses are considered to be obligate intracellular parasites, meaning that they depend on another living cell for their survival and replication. Bacteria, helminths, and protozoa, on the other hand, are able to metabolize nutrients and energy from their surroundings and can reproduce independently of a host cell. 

     

  • Q #3: Osteoporosis results from which of the following?

    A. An increase in osteocyte activity while osteoclast activity continues at expected levels

    B. A decline in osteoblast activity while osteoclast activity continues at expected levels

    C. An increase in osteocyte activity while osteoblast activity continues at expected levels

    D. A decline in osteoclast activity while osteoblast activity continues at expected levels

    Answer Explanation

     

    Osteoporosis is a condition that affects the bones, making them weak and brittle. It occurs when the balance between bone formation and bone resorption is disrupted. Bone formation is carried out by cells called osteoblasts, while bone resorption is done by cells called osteoclasts. Osteocytes are mature bone cells that maintain the bone matrix. Osteoporosis results from a decline in osteoblast activity while osteoclast activity continues at expected levels, leading to more bone loss than bone gain. This reduces the bone density and increases the risk of fractures.