answers for bio stuff
this is the concept check 1 answers to genetic of yiruses and bacteria:
1)protein coat, sheath, base plate, tail fibres
2) a protein on the surface of the phage adsorbs specifically to a receptor protein on a host cell to begin an infection. the sheath of the tail contracts, thrusting a hollow core through the membrane of the cell.
3) the phage dna molecule is incorporated by genetic recombination in a specific site on the host cell's chromosome. one prophage gene codes for a protein that represses most of the prophage genes.
for genetics supplementary tutorial pg2:
operator gene: a segment of DNA that controls the access of RNA polymerase to the genes in the operon.
repressor protein: it is a protein that binds to the operator and blocks attachment of RNA polymerase to the promotor, hence preventing transcription of the genes.
for RNA polymerase and structural gene this is my answer but i dont know if it's right:
RNA polymerase: an enzyme that joins the 3' end of an incoming nucleotide to the 5' end of the previous nucelotide to form mRNA (think there are somemore functions can check of DNA chpters)
structural gene:any gene that codes for a protein or RNA product.
for qnb the main points should be the repressor protein binding onto the operator to prevent synthesis of LacZ(which codes for B-galactosidase) in the absence of lactose. when lactose is present: allolactose inactivates repressor, allowing the binding of RNA polymerase and hence the transcription of the mRNA that produces enzymes for the lactose pathway.
(again this is my answer so anyone wants to improve on it?)
for meiosis concept check1
to increase genetic variation
allow crossing over
equally half the nuclear DNA
only once
followed by 2
ensure equal distribution
daughter cells is halved
level is haploid but DNA content is still 2x
now only x
that's about it.any other request for other anwers?if i have them i'll post.sorry for those who wants concept check2 for genetics.i dont have them.any kind soul who has it scan or take a pic and post your answers?thanks!
anyway all the best for mugging yeah?just that few more days and we can all go crazy!it's always surprising how much one can study when the days are near.so never give up!i know it's killing (who doesnt) but just hang in there!! *dangles on the bar* love love 75!xD
1)protein coat, sheath, base plate, tail fibres
2) a protein on the surface of the phage adsorbs specifically to a receptor protein on a host cell to begin an infection. the sheath of the tail contracts, thrusting a hollow core through the membrane of the cell.
3) the phage dna molecule is incorporated by genetic recombination in a specific site on the host cell's chromosome. one prophage gene codes for a protein that represses most of the prophage genes.
for genetics supplementary tutorial pg2:
operator gene: a segment of DNA that controls the access of RNA polymerase to the genes in the operon.
repressor protein: it is a protein that binds to the operator and blocks attachment of RNA polymerase to the promotor, hence preventing transcription of the genes.
for RNA polymerase and structural gene this is my answer but i dont know if it's right:
RNA polymerase: an enzyme that joins the 3' end of an incoming nucleotide to the 5' end of the previous nucelotide to form mRNA (think there are somemore functions can check of DNA chpters)
structural gene:any gene that codes for a protein or RNA product.
for qnb the main points should be the repressor protein binding onto the operator to prevent synthesis of LacZ(which codes for B-galactosidase) in the absence of lactose. when lactose is present: allolactose inactivates repressor, allowing the binding of RNA polymerase and hence the transcription of the mRNA that produces enzymes for the lactose pathway.
(again this is my answer so anyone wants to improve on it?)
for meiosis concept check1
to increase genetic variation
allow crossing over
equally half the nuclear DNA
only once
followed by 2
ensure equal distribution
daughter cells is halved
level is haploid but DNA content is still 2x
now only x
that's about it.any other request for other anwers?if i have them i'll post.sorry for those who wants concept check2 for genetics.i dont have them.any kind soul who has it scan or take a pic and post your answers?thanks!
anyway all the best for mugging yeah?just that few more days and we can all go crazy!it's always surprising how much one can study when the days are near.so never give up!i know it's killing (who doesnt) but just hang in there!! *dangles on the bar* love love 75!xD
0 Comments:
Post a Comment
<< Home