2. The function of the ribosome is a. to synthesize proteins b. to digest toxic

Question

2. The function of the ribosome is a. to synthesize proteins b. to digest toxic substances c. to manufacture and assemble the nucleolus subunits d. to synthesize ATP 3. Which of the following is a principle of the fluid mosaic model of cell membrane structure? a. Phospholipids form a lipid bilayer which is largely impermeable to water-soluble molecules. b. Phospholipids consist of a polar head and a non-polar tail made of three fatty acid chains. c. The lipid bilayer is a solid at room temperature, thus protecting the cell. d. All proteins associated with the cell membrane are contained in a fluid layer on the outside of the cell. 4. If a cell is impermeable to Na+ and contains only 50 Na", but the outside solution contains 500 Na', in which direction will water move? a. Water will not move at all. b. Water will move inside the cell. c. Water will move outside of the cell into the solution. d. Na and water will move outside the cell into the solution. -_-5. The function of the Golgi apparatus is a. to package, modify, and sort proteins for shipping b. to assemble amino acids to form a polypeptide chain c. to digest toxins and other harmful substances d. to synthesize ATP Which of the following organelles is not membrane bound? a. rough endoplasmic reticulum b. peroxisome c. Golgi apparatus d. ribosome 6. 7. The type of transport that requires a protein to serve as a binding site for small lipid- insoluble molecules to move across the plasma membrane is called a. osmoSts b. carrier mediated facilitated diffusion c. channel mediated facilitated diffusion d. active transport 8. The is the organelle that forms the two subunits involved in protein synthesis. a. ribosome b. mitochondrion c. rough endoplasmic reticulum d. nucleolus

Explanation / Answer

Answer:

2). A. To synthesize proteins

Explanation: Proteins helps to synthesize proteins. Especially, translation process of protein synthesis occurs in ribosomes.

3). A. Phospholipids form a bilayer that is largely impermeable to water-soluble molecules.

Explanation: As cell membrane is made of phospholipids, it is impermeable to water soluble molecules.

4). C. Water will move outside of the cell into the solution

Explanation:

As low Na+ ions in the cell, its concentration is lesses than the outside solution (500 Na+). Water will move from low concentration solution to high concentration solution according to osomosis.

5). A. To package, modifiy and sort proteins for shipping

6). D. Ribosomes

7). C. channel mediated facilitated diffusion

8). A. ribosomes

Explantion: each ribosome consists fo two subunits, large & small subunits. 80s ribosomes consists of 40s & 60 subunits whereas 70s ribosomes consists of 30s & 50 subunits as small and large subunits respectively.

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