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AQA BIOL5 Biology Unit 5 Exam - 22nd June 2011

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I am a bit confused about Ca ions, T-tubules and the sarco reticulum. I know how it contracts but how does a Ca ion come into contact with the tropomyosin (pathway)?

The calcium ion binds to tropomyosin and removes it which reveals the binding site on actin for the myosin heads to bind to.

Reply 1561

Zakir

Original post by RMS184

It involves cutting DNA with a series of different restriction endonucleases. The fragments that have been cut off are seaprated by gel electrophoresis. Then the Recognition Sites can be determined by the patterns that each fragment produces.

How does looking at the recognition sites help put the fragment back together?

:s

Reply 1562

RMS184

Start off a question ping pong!?

Reply 1563

NRican

Original post by Sparkly-Star

The calcium ion binds to tropomyosin and removes it which reveals the binding site on actin for the myosin heads to bind to.

Yeah thanks I get that but I was more concerned with the pathway of Ca ions? and reabsorbtion while muscle is relaxed?

Original post by RMS184

Start off a question ping pong!?

Name all the enzymes involved with DNA in our syllabus and their function :biggrin:

(edited 12 years ago)

Reply 1564

Sparkly-Star

Original post by NRican

Yeah thanks I get that but I was more concerned with the pathway of Ca ions? and reabsorbtion while muscle is relaxed?

Haha, I know which bit you mean now. After doing loads of exam questions on this chapter I just ignored the bit about T - Tubulus and so on. :p:

I didn't see anything about it. You only need to know that energy is require for the re - absorption of calcium ions.

Reply 1565

cws121

do we have to know about cystic fibrosis and CFTR, its in the textbook but not in the specification :s-smilie:

???

Reply 1566

strawberry_cake

I've been over mod 2 and 4 in detail a couple weeks ago, but havent had time for mod1. I have so much to get through today by tomorrow...its killing me :frown:

what would you guys suggest doing for mod 1? Just reading over or would you suggest going over certain topics in detail? I wish I had one more day :frown:

Reply 1567

NRican

Original post by cws121

do we have to know about cystic fibrosis and CFTR, its in the textbook but not in the specification :s-smilie:

???

No just how Gene therapy works and its effectiveness but might come in useful for the essay as it involves movement of water and ions :wink:

Reply 1568

Ineluctable

I haven't worried about synoptic essays up till now. Unit 5 is big enough without having the learn the material from the other units...fml

Reply 1569

?!master?!mini?!

Original post by strawberry_cake

I've been over mod 2 and 4 in detail a couple weeks ago, but havent had time for mod1. I have so much to get through today by tomorrow...its killing me :frown:

what would you guys suggest doing for mod 1? Just reading over or would you suggest going over certain topics in detail? I wish I had one more day :frown:

You need mod 5 in detail.

mod1,2,4 you just need to know main stuff. not details. ffs essay is only 25 marks

Reply 1570

Ineluctable

Original post by cws121

do we have to know about cystic fibrosis and CFTR, its in the textbook but not in the specification :s-smilie:

???

No. I think they put it in there because it was in the old specification

Reply 1571

sammycjones

Original post by NRican

I am a bit confused about Ca ions, T-tubules and the sarco reticulum. I know how it contracts but how does a Ca ion come into contact with the tropomyosin (pathway)?

the electric impulse makes Ca ions from the sarco reticulum, travelles down the t-tubules made of sarcolemma (muscle membranes folding inwards)
the Ca ions binds to troponin which changed the shape of tropomyosin making the binding site free

:smile:

Reply 1572

cws121

BIOL1 is probably the most important one aswel for synoptic, it has all the core principles, revise the biochemistry stuff and digestion as that can be included in a lot of essays

Reply 1573

strawberry_cake

Original post by sumsam

what would be your dream essay? mine would the different ways in which an organism uses ATP? or about basic cell cycle/structure. OR 'TELL ME 25THINGS YOU'VE LEARNT IN BIO! :biggrin:

hehe!

If only... *sigh*

Reply 1574

Flux_Pav

guys what is 80UMS and 120 UMS in terms of marks out of 100?

Reply 1575

IFondledAGibbon

Discuss the benefits and limitations of genetic engineering. (25 marks).

Anyone dare to offer up a plan?

I guess you wouldn't be allowed to use gene sequencing and probes since that's not really recombinant DNA technology...