Biochemistry help please! 1. Linoleic acid A: has two double bonds, one between
ID: 889186 • Letter: B
Question
Biochemistry help please!
1. Linoleic acid
A: has two double bonds, one between carbos 8 and 9, one between carbons 11 and 12
B: has shortened by 2 carbons, witha double bond bridging the original carbons 9 and 12
C: is an omega 3 fatty acid
D: is labeled 18:2 (triangle 9,12):
E: all of the above
2: in B-DNA
A: the rise between two adjacent bases in one strand is ~3.4 angstrom
B: each complete turn of the helix includes ~ 10 base pairs
C: the diameter of the helix is ~20 angstrom
D: there are ~10.4 base pairs per turn
E: all of the above are correct
3: Match 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 a nucleotide;
(A) phosphodiester bond
(B) n-glycosidic bond
(C) hydrogen bond
A: a;b;c
B: c;b;a
C: a;c;b
D: c;a;b
E: b;a;c
4. which of the following statements concerning fatty acids is CORRECT?
A; they all contain one or more double bonds
B: they may have either a carboxylic, aldehyde, or hydroxyl at position one
C: most of htem contain an even number o fcarbonds
D: they are a constiutent of sterols
E: they are strongly hydrophillic
5. the typical ratio between the bases in DNA
A: A=T
B: C=G
C: A + G= T + C
D: A + C = G + T
E. all of th above are correct
6. which of the following is NOT true of sterols?
A: cholesterol is a sterol that is commonly found in mammals
B: they are commonly found in bacterial membranes
C: they are more common in plasma memberanes than in intracellular membranes (mitochontria, lysosomes,e tc)
D: they are precursors of steroid hormones
E: they have a sturcutre that includes four fused rings
7. in standard fatty acid nomenclautre, number 2 is assinged to:
A: the last carbon in the fatty acid tail
B: the carboxyl carbon
C: the carbon right after the carboyl carbon
D: the first double bond carbon
E: none of the above
8: which of the following is CORRECT about the DNA strand structure?
A: the backbone is composed of alternating sugars, bases and phosphates
B: the 5' end has three phosphate gorups
C: the 3' end has one phosphate group
D: the bases are stabilized by hydrogen bonds to the phosphate groups
E: all of the above
9: which of the following lipids does NOT contain an ether linkage?
A: waxes
B: plasmalogens
C: archael lipids
D: sphigosines
E: they all contain an ether linkage
10: in addition to hydrogen bonds in the base pairs, the double helix of DNA in the B-form is stabilized by;
A: hydrogen bonds between the bases and the phosphate groups
B: base stacking interaction between adjacent base pairs
C: direct hydrogen bonds between the sugars of each strand
D: ionic onds between the phosphate groups of the two strands
E: all of the above
11. biological waxes are
A: esters of a long chain fatty acid with a sphingolipid
B: esters of glycerol and a long chain alcohol
C: esters of glycerol and three long chain saturated fatty acids
D: esters of a long chain fatty acid with long chain alcohol
E: none of the above
12. which of the following lipids contains more than one glycerol group?
A: phosphatidyl glycerol
B: lipids of archea
C: cardiolipin
D: all of the above
E: none of the above
13: an enzyme that removes the phosphoryl group off a phospholipid's glycerol backbone is
A: phophatase
B: phospholipase C
C: phospholipase A
D: phospholypase D
E: none of the above
Explanation / Answer
1) Linoleic acid : (E) All of the above.
2) in B-DNA : (C) the diameter of the helix is ~20 angstrom.
4) which of the following statements concerning fatty acids is CORRECT : (A) they all contain one or more double bonds.
(E) they are strongly hydrophillic.
9) which of the following lipids does NOT contain an ether linkage? : (A) Waxes.
11) Biological waxes are : (D) esters of a long chain fatty acid with long chain alcohol.
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