Bio quiz 1, The cell theory states, biology homework help
| 1. The cell theory states that A. all cells have nuclei B. all life is comprised of one or more cells C. life begins at conception D. all of the above |
| 2. Prokaryotes differ from eukaryotes in the following manner: A. prokaryotes have nuclei; eukaryotes lack nuclei B. prokaryotes lack ribosomes; eukaryotes have ribosomes C. prokaryotes have circular DNA; eukaryotes have linear DNA D. prokaryotes lack cell membranes; eukaryotes have cell membranes |
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3. Apoptosis, pronounced apo-toe-sis, results in A. cells without nuclei B. webbed fingers and/or toes C. supernormal number of fingers and toes D. cell death |
| 4. The human body has about __________ different cell types. A. 10 B. 100 C. 200 D. 500 |
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5. Plant cells are unlike animal cells because A. they possess plasmodesmata B. they lack an endoplasmic reticulum C. they possess Golgi bodies D. lack spindle fibers |
| 6. rRNA A. is found outside the nucleus in the cytoplasm B. is a structural element of ribosomes C. is read by ribosomes D. all of the above |
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7. Ribosomes A. construct proteins B. contain proteins C. contain RNA D. all of the above |
| 8. All of the following have membrane boundaries EXCEPT A. coated vesicles B. lysosomes C. tonoplasts D. microtubules |
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9. The cytoskeleton is defined by all of the following EXCEPT A. microtubules B. endoplasmic reticulum C. intermediate filaments D. microfilaments |
| 10. Capillary fenestrations A. are found in endothelial cells B. prevent leaks of plasma from blood vessels C. allow white blood cells to enter tissues D. are plant plasmodesmata |
| 1. Membrane phospholipids A. have positive charges B. have negative charges C. are amphipathic D. all of the above |
| 2. Coacervates differ from micelles because A. only micelles have an outer polar or charged surface B. only coacervates have an outer polar or charged surface C. coacervates contain water D. micelles are double-layered |
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3. The innermost fluid-filled volume of the mitochondrion is called the A. matrix B. cytoplasm C. Krebs D. endoplasmic reticulum |
| 4. Which of the following requires energy expenditure for molecules to cross the membrane A. simple diffusion B. sodium-coupled transport C. facilitated diffusion D. bulk flow |
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5. Which of the following requires a cohesive stream across the membrane A. simple diffusion B. sodium-coupled transport C. facilitated diffusion D. bulk flow |
| 6. Porins A. are highly selective channels B. require small amounts of energy for transport C. require large amounts of energy D. are common in structural membranes |
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7. The sodium-potassium exchange pump A. exchanges 2 sodiums for 3 potassiums B. is a symport channel C. converts ADP to ATP D. creates a negative cell interior |
| 8. The entrance of glucose into the cell via sodium-coupled transport A. requires a high internal sodium concentration B. is an example of an antiport channel at the point of entry C. requires no energy at the site of entry D. requires a high glucose concentration outside the cell |
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9. Which of the following is true A. Dirt is amphipathic and grime is amphipathic B. Dirt is hydrophilic and grime is amphipathic C. Dirt is hydrophilic and grime is hydrophobic D. Dirt is amphipathic and grime is hydrophilic |
| 10. Which of the following are not membrane bound structures A. ribosomes B. nucleus C. mitochondria D. erythrocyte |
