8. Which of the following does not apply to chloroplasts? a. They cortain chloro

Question

8. Which of the following does not apply to chloroplasts? a. They cortain chlorophyl and the enzymes required for photosynthes b. They contain an internal membrane system consisting of thylak ods c. They synthesize ATP (adenosine triphosphate) from ADP (adenosine diphosphate) and Pi (inorganic phosphate) d. They are bounded by two membranes, the inner of which is fokled into the cristae 9) Which o tie following is a major cause of the size limits for certain types of cells? A) limitation on the strength and integrity of the plasma membrane as cell size increases B) the difference in plasma membranes between prokaryotes and cukaryotes C) evolutionary progression in cell size; more primitive cells have smaller sizes D) the need for a surface area of sufficient area to support the cel's metabolic needs Eytigid cell walls that limit cell size expansion E 10) Which organelle or structure is absent in plant cells? A) mitochondria B) Golgi vesicles C) microtubules D centrosomes E) peroxisomes 11) Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules? A) lipids B) glycogen C) proteins D) cellulose Enucleic acids

Explanation / Answer

Ans 8 This is the description of the mitochondria. The mitochondria is a double-membraned structure, with the inner membrane folded. These folding help increase the surface area of the mitochondria.

Ans 9 the correct answer is A. The structure of the cell membrane (even if it has a cell wall) is very fragile. It needs to perform many functions like endocytosis and exocytosis. The structures that enable the membrane to do these functions also make it fragile.

As the size of cells increases, the risk of damage to the cell membrane also increases. This puts a limit to the maximum size of cells - especially of animal cells because they lack cell walls.

Ans 10 answer D is correct. Even though the plant cell lacks a centrosome, which is involved in the arrangement of microtubules, mitosis occurs properly in plant cells. The cell wall arranges the microtubules.

Ans 11 The correct option is C. Ribosomes are involved in the translation of mRNA. They join amino acids to form a peptide chain which is later folded into a protein. Hence they are involved in protein synthesis

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