bebe1018_87

i have to fill in the blanks for the following questions using the following choices (some will be used once, others more than once, and others not at all) : z-dna, cruciform structure, mirror repeat, hairpin structure, g-tetraplex, triplex dna, hoogsteen pairs, a-dna, duplex dna, inverted repeat. 1. A(n) ____ does not have complementary sequence on the same strand. 2. a(n) _________ is self-complementary. 3. a sequence, such as a palindrome, that can be rotated 180 degrees horizontally and 180 vertically in order to superimpose a sequence repeat on the other sequence is a(n):__________ 4. a four-stranded, right-handed helix formed by a dna segment containing a high proportion of guanine residues is known as a(n)_______________ 5. in a(n) _____________, interstrand hydrogen bonds break and intrastrand hydrogen bonds form. 6. an inverted repeat that occurs within a single dna strand is a(n)_________ 7. the sequence -GTGAG........CTCAC- -CACTC.........GAGTG- is a(n)_____________ and has the potential to form a(n)______________. 8. _____________ can form when a polynucleotide strand forms ___________ with functional groups in the major groove of a homopurine-homopyrimidine duplex that can contain a mirror repeat. 9. a single dna strand with the sequence-ATATG.....CATAT-can form a(n) ______________. the hint given is a mirror repeat has symmetry such that folding the sequence back onto itself superimposes the bases. however, then folding the the sequence onto the opposite strand does not superimpose the bases. consider whether a mirror repeat has a superimposable sequence in the complementary strand. thank you so much for your help! My answers were the following but some are incorrect: 1. mirror repeat 2. duplex dna 3. mirror repeat 4. g-tetraplex 5. hairpin structure 6. mirror repeat 7. inverted, cruciform structure 8. triplex dna, hoogsteen pairs 9. hairpin structure Thank you !

which apply to dna, which to rna, which to both and, which to neither. are my answers correct? 1. contains sugar 3'- deoxyribose--> neither 2. containes sugar 2'-deoxyribose--> dna 3. secondary structure is primarily a double helix--> dna 4. sometimes contains the nucleoside pseudouridine--> rna 5. contains the purine guanine--> both 6. sugars are connected with a 3'-5'phosphodiether link--> neither b/c its a phosphodiester not ether 7. in base composition, %A=%T --> DNA 8. bases are attached to sugars in a beta-glycosidic linkage. --> both 9. sometimes shows hydrogen bonding between a sugar hydroxyl and a base--> both 10. contains the pyrimidine uracil--> rna 11. in base composition, %A=%C--> neither thank u so much!

Chymotrypsin mechanism? what are the correct steps for the mechanism of chymotrypsin? Below is my answer but I don't know if it is right. a) His 57 catalyzes removal of H from Ser 195 hydroxyl. b. Ser 195's nucleophilic O attacks carbonyl C of substrate. c. His 57 donates H to N of sissile peptide bond, tetrahedral intermediate decomposes. d. C- terminal portion of oribinal substrate with its new amino acid terminus diffuses away. e. water donates H to His 57. f. Resulting OH attacks carbonyl of remaining substrate. g. His 57 donates H to Ser 195 O, leading to collapse of tetrahedral intermediate. h.N-terminal portion of original substrate with its new carboxy terminus diffuses away. My answer is b,a,c,e,f,g,h,d. Is this right? Thank you!

hello, if anyone could help me with these biochem problems I will greatly appreciate it! a) if you magnify a cell 10,000 fold, how big will it appear if the the is eukaryotic with a cellular diameter of 50micrometers? I did 50micrometer= 5.0x10^-5m 5.0x10^-5m times 10,000= 0.5m 0.5m equals 500mm, which is the answer, but how do I solve the following parts? b) if the cell was a muscle cell, how many actin molecules could it hold, if the cell is spherical and there are no other cellular components present and actin molecules are spherical with a 3.6nm diameter. and the volume of the sphere is 4/3(pi)®^3. I did 3.6nm/2= radius= 1.8nm=1.8x10^-9m the 50micrometers of the cell equal 5.0x10^-5m then I did 5.0x10^-5m/1.8x10^-9m= 2.77777777x10^8, but the answer is 2.7x10^12 actin molecules c) if this were a liver cell of the same dimensions how many mitochondria could it hold? (the cell is also spherical, no other components present and the mitochondria are spherical with a diameter of 1.5micrometers) The answer is 36,000 mitochodria, but how do I solve it?