7. steroids such as cholesterol are synthesized by a.chioroplasts b. lysosomes c
ID: 141158 • Letter: 7
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7. steroids such as cholesterol are synthesized by a.chioroplasts b. lysosomes c. the smooth ER d. the Golgi apparatus. 58. An organelle consisting of a series of flattened sacks stacked somewhat like saucers is the a. mitochondrion. b. Golgi apparatus. c chloroplast. d. rough endoplasmic reticulum. e. flagellum. 69. A secondary lysosome is a lysosome that a. provides a backup to the primary lysosomes b. is smaller than a primary lysosome. c. will become a primary lysosome when it fuses with a phagosome. d. is a primary lysosome that has fused with a phagosome. e. has exocytosed 70. Microtubules are composed of monomers of a. alpha and beta-tubulin. b. alpha and beta-actin. c alpha and beta-myosin. d. Gamma tubules. e. Gamma actinomin. 71. Which type of organelle is found in plants but not in animals? a. Ribosomes c. Nuclei d. Plastids e. None of the above 72. Chloroplasts are the structures in which a. chemical energy is stored in the form of ATP b. cell division is controlled. c. genetic information is used to make proteins d. sunlight energy is converted into chemical energy e. new organelles are made. 73. In the photosynthetic formation of ATP, the enzyme ATP synthase couples the synthesis of ATP to a. the diffusion of protons b the reduction of NADP c. the excitation of chlorophyll. d. the reduction of chlorophyll. e. CO, fixation.Explanation / Answer
67. De Novo biosynthesis of steroid, like cholesterol occurs in the smooth endoplasmic reticulum, as it contains the major enzymes required for the synthesis.
Answer: c- the smooth ER.
68. Golgi flattened apparatus comprises sacks called the cisternae, which are stacked on top of one another, and attached to endoplasmic reticulum.
Answer: b – Golgi apparatus.
69. Lysosomes containing enzymes in inactive state are called primary lysosomes. When the primary lysosomes fuses with phagosomes are called secondary lysosomes.
Answer: d- is a primary lysosome that has fused with a phagosome.
70. Microtubules are made up of tubulin proteins. Tubulin consist of monomers alpha-tubulin and beta-tubulin.
Answer: a- alpha-tubulin and beta-tubulin.
71. Plant cells, algae, and some other eukaryotic cells have a double-membraned organelle called plastid. Plastids contain pigments and may be chloroplast, chromoplast or leucoplast. Plastids are typical absent in animals. Though some animal cells may acquire and use plastids for some short period.
Answer: d- plastids.
72. Photosynthetic pigments are present within the lamellae of an organized chloroplast. Photosynthetic organisms and plants, have pigments, that can absorb a specific quantum (absorption spectra) of light energy or photons. The light energy absorbed is converted to chemical energy (glucose)
Answer: d- sunlight energy is converted into chemical energy.
73. ATP synthase complex, designated as F0F1- ATP synthase, is located within the mitochondrial cristae. They help in back flow of proton, creating free energy to generate ATP. ATP synthase is composed of two parts: a) Coupling factor 1 (F1)- which contains the catalytic subunit of ATP synthase. b) Coupling factor 0 (F0) – which act as a proton channel between mitochondrial matrix and intramembranous mitochondrial space.
Answer: a- diffusion of protons.
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