Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
** LC BIOLOGY 2014 - Before and after discussion **
Options
Comments
-
-
-
-
-
-
Advertisement
-
-
-
I am confused now... So was that sex linkage or not? Q10.
I can't remember what I said.
Also, a harmful member of monera? you could have used any harmful bacteria right?
Also what's the use of storing atp? Gosh, I feel like I am going to become a D student. I haven't gotten less than an A2 in this subject before. Omg
the more I think about it the more I realise that I might have made.mistakes. or I could just genuinely be stressing for no reason. 0 -
-
-
Advertisement
-
-
-
forlifebaby wrote: »I am confused now... So was that sex linkage or not? Q10.
I can't remember what I said.
Also, a harmful member of monera? you could have used any harmful bacteria right?
Also what's the use of storing atp? Gosh, I feel like I am going to become a D student. I haven't gotten less than an A2 in this subject before. Omg the more I think about it the more I realise that I might have made.mistakes. or I could just genuinely be stressing for no reason.
Sex linkage means on x or Y chromosome . In the diagram they were only there for identifying gender .it was male .
The alleles weren't on the x or Y chromosome . Hope this clears things up0 -
-
-
-
-
-
Sex linkage means on x or Y chromosome . In the diagram they were only there for identifying gender .it was male .
The alleles weren't on the x or Y chromosome . Hope this clears things up
Perfect.
thank you. I was just looking over the comments here and one of the comment just made me self-conscious. 0 -
-
Advertisement
-
-
-
-
-
For the question 'Suggest two methods of cross pollination' I said Insects and Humans.. didnt think of saying wind, would Humans be accepted? Like I said something along the lines of how they can cross pollinate plants artificially
I think animals and wind and insect would have been right. Did you put animals in bracket after human? That would get you the mark if you did.
0 -
-
forlifebaby wrote: »I think animals and wind and insect would have been right. Did you put animals in bracket after human? That would get you the mark if you did.
I dont know I dont think so
Ah well, only 3ish marks :pac:
I did every single question so heres to hoping I got full marks in a few :pac:0 -
-
-
Advertisement
-
To get compound microscope power you just multiply the powers of the lenses, so all you had to do was divide 0.8 by 400 = 0.002 mm, yeah. Even if you don't bring your calculator, you can do it in your head grand if you split it up and say 0.8 divided by 4 = 0.2, divided by 100 = 0.002.
At first I thought the circulatory thingie was hard to read, but I figured since the high pressure of the arteries is what makes the tissue fluid kind of leak out that it was A. And the thing with the valves was going into the tissue fluid so I'd say it was defo a lymphatic thing. I said lymphatic duct, should've said lymphatic vessel to be more safe really but wfigmgem
And once you narrow it down that far, the vessel down the other side of the capillary has got to be a vein. I found the fact that there were valves on the other thing a bit offputting, but I'm pretty sure that's how it was.Answer the following questions in relation to carbon dioxide.
(i) Name a structure found in cells in which carbon dioxide is produced.
(ii) Give a feature of a capillary which allows the rapid uptake of carbon dioxide.
(iii) Carbon dioxide levels are usually higher in venous blood than in arterial blood.
Why is this the case?
(iv) Name a blood vessel which is an exception to the situation outlined in (iii) above.
Give a reason for the exception.
(v) Briefly outline the role of carbon dioxide in the control of the human breathing rate
help
This is roughly what I said:
(i) Wasn't sure about this one. I guessed mitochondria, best fit I could think of
(ii) Again not sure but I said the fact that they are only one cell thick
(iii) Because veins are bringing the blood back to the heart after the arteries have already gone all round the body exchanging oxygen for carbon dioxide, so by the time the blood gets to the veins it's all deoxygenated and full of CO2
(iv) Pulmonary Vein, because it only does a little circuit from the lungs to the heart and aorta, after the pulmonary artery takes the blood to the lungs to oxygenate it again. So it's freshly oxygenated and hasn't done any exchanging around the body yet
(v) Increased levels of CO2 in the blood form carbonic acid, which changes the blood's pH a bit. The brain takes this as a sign to increase the breathing rate to decrease the amount of CO2 and regain normal pH0
Advertisement