EBio notes gen

EBio notes gen - October 2 2007 EBIO In addition to its...

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Unformatted text preview: October 2, 2007 EBIO In addition to its relatively small size, what other characteristics of molecular oxygen O2 (O=O) allows it to pass easily through a membrane? a) Molecular oxygen is hydrophilic b) Molecular oxygen is polar c) In molecular oxygen, both atoms attract the negative electrons equally strongly d) Molecular oxygen is non-polar e) C and D are both correct Which of the following is most likely NOT t rue for the cotransport of sucrose and protons into plant cells? a) Protons are moving down their concentration gradient through the sucrose/proton cotransporter b) A substance that blocks protons from binding to the cotransport protein would also block the transport of sucrose c) Protons can move down their concentration gradient through the transport protein whether or not sucrose is present outside the cell d) The higher proton concentration outside the cell is the result of active (ATP- fueled) transport Which one(s) of the hormones below can enter a target cell without the aid of a transport protein and thus activate gene regulatory proteins directly? a) Estrogen and testosterone b) N-3 and n-6 prostaglandins c) Insulin and glucagon d) A and B e) A, B, and C Fill in the blank: In order to allow passage of water molecules across biological membranes, the outer regions of the aquaporin protein in contact with the membrane have to be _______ and the channel inside the protein has to be ______. a) Hydrophilic, hydrophilic b) Hydrophobic, hydrophobic c) Hydrophilic, hydrophobic d) Hydrophobic, hydrophilic The large lacrimal (tear) gland is responsible for generating the oil layer. What feature of eukaryotic cells would you expect to find in greater abundance in the secretory cells of the large lacrimal gland? a) Rough endoplasmic reticulum b) Smooth endoplasmic reticulum c) Golgi apparatus d) Mitochondria Which of the following types of molecules are the two major structural components of biological membranes? a) Phospholipids and cellulose b) Nucleic acids and proteins c) Phospholipids and proteins d) Proteins and cellulose e) Glycoproteins and cholesterol October 4, 2007 How are the membranes of the over-wintering conifer trees able to remain fluid when it is extremely cold? a) By increasing the % of unsaturated phospholipids in the membrane b) By increasing the % of cholesterol molecules in the membrane c) By decreasing the number of proteins in the membrane d) A and B e) A, B, and C What kinds of molecules pass through a biological membrane most easily and without the aid of a transport protein? a) Large and hydrophobic b) Small hydrophobic c) Large and hydrophilic d) Small and hydrophilic e) Monosaccharides such as glucose ATP consists of three phosphate groups, a sugar, and a nitrogenous base. What does that sound like?...
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EBio notes gen - October 2 2007 EBIO In addition to its...

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