13. Ribosomal RNAs are manufactured in which specific area of a ceukaryotie cell

Question

13. Ribosomal RNAs are manufactured in which specific area of a ceukaryotie cell? a· The nucleus b. The cytoplasm c. The nucleolus d. The chromatin 14. Match the following a. Thylakoid b. Cristae c. Cis face d. Ribosomes found on their outer membrane i) RE ii) Mitochondria ii) Chloroplast iv) Golgi complex 15·The most important factor that limits the size of a cell is- a. the amount of proteins and organelles that can be made by a cell b. the rate of diffusion c. the surface-area-to-volume ratio of the cell d. the amount of DNA in the cell 16. What is the chemical property of the exterior of the phospholipid bilayer? 17. If a cell is in a hypertonic environment, then which of the following is true? The cell will gain water and burst. b. No water will move across the membrane. There will be no effect c. The cell will lose water and shrink. d. Osmosis still occurs, but there is no net gain or loss of cell volume. protein. 18. In the process of receptor-mediated endocytosis, the receptor is a membrane protein. but the clathrin is an example of a a. carrier, channel b. transmembrane; peripheral c. pump; uniporter d. phagocytosis; pinocytosis 19. What variable(s) influences whether a steroid molecule can move across a membrane by passive diffusion? a. The structure of the phospholipids bilayer b. The difference in concentration of the molecule across the membrane c. The absence of transport proteins in the membrane d. All of the above

Explanation / Answer

13. c) the nucleolus

explanation: cytoplasm serves as gel state matrix for holding all the organelles in the cell, the nuceus functions as a genetic hub containing chromosomes with DNA in prime and thechromatin is a protein that is associated with chromosome and has no role in production of rRnas. so the correct answer is the nucleolus which is responsible for synthesis of proteins in the cell.

14. a) Thylakoid matches with iii)chloroplast (thylakoid is one of the part of structural unit called grana in chloroplast)

b)Cristae matches with ii)Mitochondria (the inner matrix of mitochondria contains some infoldings which is named as cristae.

c)Cis face matches with iv)Golgi complex(vesicles that are separated from rough endoplasmic reticulum and transfers all their lumen into golgi apparatus)

d)Ribosomes found on the outer membrane matches with i)RER (RER got its name as rough endoplasmic reticulum becuase of the attachment of ribosomes on its surface.)

15.c)the-surface-area-to-volume ratio of the cell

explanation:cells increase their surface area in order to contain all nutrients minerals and water in the cell in order to sustain. this happens through the pathway via surface and requirements of the cell is directly involved with its volume. more the volume , more the requirements.

16.Chemical property of the exterior surface of the phospholipid billayer is its hydrpophilic/polar end which is more attracted to water molecule.

17.c) the cell will lose water and shrink as cellshave semi permeable membrane which allows cetain molecules and water to easily pass through. in a hypertonic solution osmosis from high concentration to low concentration takes palce and forces the water out of the cell.

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