Biology Exam Chat + Exam Copy + Answers (now)

[daizy]

can someone put up all teh solutions to teh Multiple choice. Mine were :
1c,2d,3b,4d,5c,6b,7c,8d,9a,10b,11c,12d,13c,14c,15a,16b,17d,18a I guessed the rest- ran out of time ! lol

[Ravit]

yes it should be the nucleus as the questions was obiously discussing transcription and translation... well thats my reasoning anyway

[ezye21]

why cant you assume they both have homologous chromosomes ?

[Panicmode]

can someone put up all teh solutions to teh Multiple choice. Mine were :
1c,2d,3b,4d,5c,6b,7c,8d,9a,10b,11c,12d,13c,14c,15a,16b,17d,18a I guessed the rest- ran out of time ! lol

This is what both Bazza and I had;


1. C
2. D
3. B
4. D
5. C
6. B
7. C
8. D
9. A
10. B
11. C
12. D
13. C
14. C
15. A
16. B
17. A
18. A
19. C
20. A
21. B
22. D
23. C
24. B
25. B


However, these are not confirmed.

why cant you assume they both have homologous chromosomes ?

The question specifically states that males arise from unfertilised gametes. They are therefore haploid organisms and do not have chromosomes organised in homologous pairs

[ezye21]

extended response solutions anyone ?

[Keo]

extended response solutions anyone ?

Lexitu and connectedu is working on it now

[KOM]

I'm pretty sure MC.3 isn't B because gene therapy doesn't REPLACE defective alleles, a normal allele is introduced so the normal protein can be synthesized. Correct me if I'm wrong? I put D

[cricketstar]

i actually wasn't sure about that question either..... what does everyone else think, cause it could have well been option D - "DNA replacement"

[Panicmode]

Again, these are just what I got.

I'm pretty sure it's right though considering the alternatives;

- It's definitely not A (cell cloning)
- It's definitely not C (triplet change)
- It could maybe sorta kinda possibly have the chance of considering being D,


But B fits the answer much better imo.

EDIT:

Strike that, the answer is definitely B. Look here; "Gene therapy is the insertion, alteration, or removal of genes within an individual's cells and biological tissues to treat disease" Quoted from wiki.

[KOM]

I agree on you for the rest of your answers, but I remember hearing either from douchy or another source that gene therapy doesn't replace the defective allele but the normal allele is simply introduced?

[Panicmode]

I agree on you for the rest of your answers, but I remember hearing either from douchy or another source that gene therapy doesn't replace the defective allele but the normal allele is simply introduced?

I just googled it and the definition of gene therapy is;

"The transplantation of normal genes into cells in place of missing or defective ones in order to correct genetic disorders."

Therefore, the answer is B.

[LukeMcA]

I also had B. The other answers I (personally) don't think fit the question. Gene Therapy seemed to be the closest (and most logical) answer.

[Russ]

Strictly speaking gene therapy won't exactly replace the defective allele but "DNA replacement" isn't really a specific term in biology. I'm pretty sure the answer is gene therapy

[HERculina]

but then only "some" stem cells are from 2 or 4 cell embryo (totipotent ones)? or am i wrong?

Yes, but the question states, "can be obtained" not "can only be obtained" or "are obtained"

Therefore, since the other answer refers to all stem cells and this one gives a possible source, it is the correct answer. (However hopefully they'll be lenient and see the massive ambiguity in the question)

.     Cool hopefully they mite accept D too. all my other mc matched bazzas except one i didnt read properly -.- and the short answer was a blur cause it was so rushed :S          I circled gene therapy too cause i remebered a definition that said it replaced disfunctioning alleles...   Omagod so glad the exam is over woooot hooot

[KOM]

I agree on you for the rest of your answers, but I remember hearing either from douchy or another source that gene therapy doesn't replace the defective allele but the normal allele is simply introduced?

I just googled it and the definition of gene therapy is;

"The transplantation of normal genes into cells in place of missing or defective ones in order to correct genetic disorders."

Therefore, the answer is B.

Gene therapy delivers functional genes to overcome defective alleles but it doesn't replace the allele physically?
From the wording of the question, it's saying it replaces it physically. I may be wrong.