Test
Lipids and Nucleic Acids: Fatty Acids, DNA Structure
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Preguntas del test (23)
1The typical ratio between the bases in DNA
- AA=T
- BC=G
- CA+G = T+C
- DA + C = G+T
- EAll of the above
2Biological Waxes are...
- Aesters of a long-chain fatty acid with a sphingolipid
- Bester of glycerol and long-chain alcohol
- Cesters of glycerol and three long-chain saturated fatty acids
- Desters of long-chain fatty acids with long-chain alcohols
- Enone of the above
3Which of the following lipids contain a fatty acid?
- APlasmalogen
- Bprostaglandin
- Csphingolipids
- Dglycerophospholipids
- Eall of the above
4In standard fatty acid nomenclature, number 2 is assigned to
- Athe carbonic the fatty acid tail
- Bthe carboxyl carbon
- Cthe carbon right after the carboxyl carbon
- Dthe first double bond carbon
- Enone of above
5Which of the following statements concentring fatty acids is correct?
- AThey all contain one or more double bonds
- BThey may have either a carboxylic, aldehyde, or hydroxyl position
- Cmore of them contain an even number of carbons
- DThey are a constituent of sterols
- EThey are strongly hydrophilic
6Which of the following is an enzyme that removes a fatty acyl group from a phospholipid?
- AProtein phosphotase A
- BProtein Kinase A
- CPhosphorylase Kinase A
- DPhospholipidase A
7What is TRUE about double bonds in fatty acids:
- AMost organisms produce about equal proportion of cis- and trans- fatty acids
- Btrans-fatty acids have a lower melting point than cis-fatty acids
- Ccis-fatty acids pack more densely in biological membrane
- Dtrans fatty acids and mostly associated with industrial processes
- Eall of the above
8Which of the following is TRUE of sphingolipids
- AThey always contain glycerol and fatty acids
- Btheir fatty acid linkage is a carbon (organic) ester
- Cthey do not contain glycerol
- Dthey may contain up to three fatty acids
- Ethey may be charged, but are never amphipathic
9Which of the following lipids contains more than one glycerol group?
- APhosphatidyl glycrol
- Blipids of archea
- Ccardiolipin
- Dall of the above
- Enone of the above
10An enzyme that removes the phosphoric group off a phospholipid's glycerol backbone is:
- Aphosphatase
- Bphospholipidase c
- Cphospholipdase a
- Dphospholipidase d
11Industrial processes hydrogenation has which of the following effects
- Aconverts many cis double bonds to trans double bonds
- Bconverts many single bonds to cis double bonds
- Cincreases the melting temperature of vegetable oil
- Dconverts vegetable oil from a solid to a liquid at room temperature
- EA and C are correct
- FB and D are correct
12Match the type of bond with the role below:
A _____ joins adjacent ribosyl units in one strand; a _____ joins complementary bases in two strands; A ______ links base to ribose in nucleotide
A) phosphodiester bond
B) N-glycosidic bond
C) hydrogen bond- Aa;b;c
- Bc;b;a
- Ca;c;b
- Dc;a;b
- Eb;a;c
13In the formation of a nucleotide from a ribose, a phosphate, and a nitrogenous base --
- AA water molecule is formed
- BTwo water molecules are formed
- CThree water molecules are formed
- DOne water molecule is formed, but it is used immediately to complete the nucleotide, so zero water
14Which of the following is a legitimate precursor for DNA synthesis?
- ADeoxynucleoside-triphosphate
- BNucleoside-triphosphate
- Cnucleoside monophosphate
- Ddeoxynucleoside-monophosphate
15Which of the following is CORRECT about the DNA stand structure?
- AThe backbone is composed of altering sugars, bases, and phosphates
- Bthe 5' end has three phosphate groups
- CThe 3' end has one phosphate group
- DThe bases are stabilized by hydrogen bonds to the phosphate groups
16Which of the following deoxyoliogonucleotides will hybridize with DNA containing the sequence (5')AGACTGGTC(3')?
- A(5')CTCATTGAG(3')
- B(5')GAGTCAACT(3')
- C(5')TCTGGATCT(3')
- D(5')TCTGACCAG(3')
- E(5')GACCAGTCT(3')
17In addition to the hydrogen bonds in the base-pairs, the double helix of DNA in the B-form is stabilized by:
- Ahydrogen bonds between the bases and the phosphate groups
- Bbase-stacking interaction between adjacent base-pairs
- Cdirect hydrogen bonds between the sugars of each strand
- Dionic bonds between the phosphate groups of the two strands
- Eall of the above
18In B-DNA:
- Athe rise between two adjacent bases in one strand is ~3.4 A
- BEach complete turn of the helix includes ~ 10 base-pairs
- CThe diameter of the helix is about 20 A
- DThere are ~10.4 base pairs per turn
- Eall of the above are correct
19Linoelic acid:
- Ahas two double bonds, one between carbons 8 and 9, one between carbons 11 and 12
- Bhas shortened by two carbons, with a double bond bringing the original carbons 9 and 12
- Cis an omega 3 fatty acid
- Dis labeled 18:2 ( delta 9,12)
- Eall of the above
20In the double helix model of DNA
- Aa purine none strand always hydrogen bonds with a purine in the other strand
- BA-T pairs share two hydrogen bonds
- Cat each end of the helix there are either two 3' ends or 2 5' ends
- Dthe 5' ends of both strands are at one end of the helix
- Ethe bases point toward the outside of the helix
21Which of the following are not true of sterols?
- Acholesterol is a sterol that is commonly found in mammals
- Bthey are commonly found in bacterial membranes
- Cthey are more common in palm membranes than in intracellular membranes (mitochondria, lysosomes ect.)
- Dthey are precursors of steroid hormones
- Ethey have a structure that includes four fused rings
22Which is true fro the fatty acid with the name 20:5 (delta 5, 8, 11, 14, 17)
- AIt contains 25 carbons
- BIt is considered fully saturated
- CIt is considered an omega-3 fatty acid
- DIs a monounsaturated fatty acid
23A DNA chain elongation reaction directly involves
- Aa deoxynucleoside monophosphate and the free 5' end of the growing strand
- Bdeoxynucleoside triphosphate and the three 5' end of the growing strnad
- Cdeoxynucleoside monophosphate and the free 3' end of the growing strand
- Ddeoxynucleoside triphosphate and the free 3' end of the growing strand
Información
- Descripción
- Test sobre Sin título, creado por genny stubbs el 24/05/2017.
- Autor
- genny stubbs
- Idioma
- English
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