HSC Biology Question Thread

[Bparker]

As usual, thanks for doing such a good job on this forum Skidous!

Just going to jump in on this one though. Lipid≠glucose≠amino acid≠nucleotide.

Lipids include things like sterols (including cholesterol), triglycerides and phospholipids. Glucose is a carbohydrate, amino acids are the building blocks of proteins and nucleotides the building blocks of nucleic acids. If you mean to say that lipids are used as substrates in the synthesis of these things, of course you would be exactly right; however, once they are turned into these things they cease to be lipids.

You did correctly identify how lipids are transported around the blood stream. They are packaged into small droplets, with proteins to hold them in together. They can, however, be directly placed into the bloodstream without having to worry about the lymph (only when lipids are absorbed do they travel in the lymph).

Thankyou vox nihili! Are these droplets you're referring to called chylomicrons?

[HighTide]

Thankyou vox nihili! Are these droplets you're referring to called chylomicrons?

Yeah they're chylomicrons

[Bparker]

Yeah they're chylomicrons

Mad as that makes sense now - thanks!

[Skidous]

Sorry about that, it must have gotten most up with my notes on digestive products

[vox nihili]

Sorry about that, it must have gotten most up with my notes on digestive products

No worries. If you need some help on that just let us know It's all a bit of a minefield!

Thankyou vox nihili! Are these droplets you're referring to called chylomicrons?

Just to add on chylomicrons:


(I don't know how much detail you need for HSC).

Chylomicrons only carry lipids from the gut to the tissues/liver. LDL is responsible for carrying lipids from the liver to the tissues; whereas HDL carries lipid from the tissues to the liver.

[Skidous]

No I understand it, must have just been placed in the wrong section of my table when I was writing up notes last year

[Gregs]

Hi, I was just wondering, if a gene I'd recessively sex linked on the X chromosome (males get) are those males then encouraged not to reproduce or even perhaps the mother of the child with the disease encouraged not to reproduce again.
Thanks

P.S. Not trying to offend anyone just wondering because I got a question that asks how to prevent someone with this disease from passing it on to further generations. If they are "allowed" to reproduce how else would they prevent the passing on of the disease to future generations

[Skidous]

Hi Gregs

Normally you wouldn't be asked if people who have a genetic disease should reproduce as that may hurt someone's feelings but I understand where you're coming from.
The best way to prevent the genetic disease from being transmitted is finding a cure for the genetic disease if the father has it.
For the mother there are reproductive technologies such as In Vitro Fertilisation (IVF) and preimplantation genetic diagnosis (PIGD or PGD) to produce an embryo and scan it for the disease before being implanted if the mother is a carrier.

When a question is asking about preventing diseases from being passed on you're more or less looking at lifestyle choices I.e diet, exercise, radiation exposure etc. and then saying how these can affect non-infectious disease from being passed on to future generations

Thanks for the question

P.S try to post questions that aren't as controversial next time

[Gregs]

Cheers for the answer the question was from 2001, I assume the world is a lot more politically correct now anyway ahah

[Skidous]

Not a problem, if you have any other questions let me know

[Elenaa]

Hello !!
So i was just wondering, when we draw graphs do we need to draw a line of best fit? instead of connecting the dots because my tutor told me thats what you have to do for the HSC but i don't know if i have to do that for trials because my school teachers never said anything about it.

Thanks

[Skidous]

Hi Elenaa

Yes you do more often than not have to use a line of best fit. Sometimes, however a line is not sufficient and a Curve of Best Fit is needed, which is similar to a line of best fit but curved.

In some situations, however, there are graphs which have a distinguished shape. Some examples include enzyme activity based upon
Temperature

pH

Substrate Concentration


The you will have to know when to use and interpret them.

Hope this helps, Skidous

[Skidous]

Question Time!

Does anyone know of an Australian Biologist current working in the field? and if so what work are they doing?

[Ragdolls]

Question Time!

Does anyone know of an Australian Biologist current working in the field? and if so what work are they doing?

Hey Skidoos!
Yes I know a Australian biologist. His name is George Miklos. He was the founder of Atomic Oncology. He holds a PhD in genetics and has a range of laboratory experience in biological concepts. His publications and research include genetics, developmental biology, transgenic organisms and many other biological fields.

Hope this helps! 

[Skidous]

Thanks Ragdolls, could you maybe go into a little more depth into what exactly he does?