Question

One key function of nuclear pores is to *

a. allow cells to communicate with one another.

b. aid in the production of new nuclei.

c. allow molecules such as proteins to move into and out of the nucleus.

d. form connections between different organelles.

12. Which of the following statements is not true *

a. Both mitochondria and chloroplasts provide energy to cells in the same way.

b. Both mitochondria and chloroplasts have more than one membrane.

C Only chloroplasts contain the pigment chlorophyll.

d. Both animal and plant cells contain mitochondria.

13. Thickness of plasma membrane (unit membrane) is _______ *

a. 75 Å

b. 100 Å

c. 125 Å

d. 150Å

14. Select the unicellular organism among the following. *

a. Paramecium

b. Mosquito

c. Hydra

d. Algae

15. The total solute concentration in a red blood cell is about 2%. Sucrose cannot pass through the membrane, but water and urea can. Osmosis would cause such a cell to shrink the most when the cell is immersed in which of the following ______________________. *

a. a hypertonic sucrose solution

b. a hypotonic sucrose solution

c. a hypertonic urea solution

d. a hypotonic urea solution

16. If an animal cell is placed into a solution whose concentration of dissolved substances is higher than that inside the cell___________. *

a. the cell will swell

b. the cell will shrivel

c. the solution is described as hypertonic

d. both (b) and (c) are correct

17. A series of membrane – enclosed channels studded with ribosomes are called __________________. *

a. lysosomes

b. Golgi complex

c. rough endoplasmic reticulum

d. mitochondria

18. Temporary mount of a tissue is made in *

a. wax

b. alcohol

c. glycerine

d. xylene

19. Cells were determined to be the basic structural units of plants and animals in which century *

a. 1600’s

b. 1700’s

c. 1800’s

d. 1900’s

20. The cell’s “garbage disposals” are the *

a. lysosomes

b. peroxisomes

c. mitochondria

d. vacuoles

21. Choose the best definition of ‘diffusion’. *

a. Passive movement from an area of greater concentration to one of lesser concentration.

b. Active movement from an area of greater concentration to one of lesser concentration.

c. Passive movement from an area of lesser concentration to one of lesser concentration.

d. Active movement from an area of lesser concentration to one of lesser concentration.

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Answer 1

Answer:

Nuclear pore complexes allow the transport of molecules across the nuclear envelope. This transport includes RNA and ribosomal proteins moving from nucleus to the cytoplasm and proteins (such as DNA polymerase and lamins), carbohydrates, signaling molecules and lipids moving into the nucleus.

Explanation:

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