Biology Year 12 Random Retrieval

The Amish in America are a closed community, which only reproduce with-in their own population. They are descended from 200 Swiss who migrated there. They have a much higher proportion of alleles which cause genetic disorders, rarely seen in the rest of the population. What is this an example of?

As there are now 4 chromatids in each homologous pair, they are sometimes called what?

Is there a significant difference between risk of CVD smoking -19 cigarettes a day and more than 20 cigarettes a day?

Cresol red is an indicator which goes clear at a low pH. A plate of agar jelly with cresol red added was made, and two blocks were cut out. Block A measured 10mm x 10mm x 10mm. Block B measured 20mm x 7mm x 7mm. You have chosen one which will decolourise the quickest, why did you choose that block?

A doctor vaccinated a group of patients against poliomyelitis. He gave each patient two doses of vaccine, 3 months apart. Explain the differences between the mean concentrations of antibodies in blood samples 1 and 2 .

True or false : Facilitated diffusion can use channel proteins or transport proteins, but active transport only uses transport proteins.

Which of the following organelles has a different structure in prokaryotes when compared to eukaryotes.

What is the function of this organelle?

What base does the 'T' stand for?

What base does the 'A' stand for?

How many types of organic base are there in DNA and RNA?

Name the pentose sugar found in DNA.

Where do non-competitive inhibitors bind?

On the above diagram, which letter represents the activation energy without an enzyme?

True or False : Endothermic enzyme controlled reactions do not require activation energy?

Which of the following is the best description of the 'Quaternary Structure' of a protein?

Which is the correct structure for an amino acid?

What is the name of the NH₂ group on an amino acid molecule?

Which reagent is used to test for reducing sugars?

What type of sugar is fructose?