Biology Year 13 Random Retrieval

Which term is used to describe the full process of genetic code in DNA being turned into a polypeptide chain?

The mRNA travels to the ribosome, where it feeds between the two subunits, exposing the template bases. tRNA molecules each carry a specific amino acid at the top, with a complementary sequence of three bases called an _____7_____ at the bottom. The tRNA anticodons then complementary base pair with the mRNA ____8____.

In the ribosome there are 3 binding sites for tRNA, two where a ____9____ bond is formed between the carried amino acids. These amino acids then form a ____10_____ chain which leaves the ribosome. The third site is a departure site, where the tRNA which has released its amino acid departs to pick up a new amino acid.

Once the entire mRNA sequence has been ____11____, it can either pass into another ribosome to make another polypeptide or be degraded.

If a template strand has the code starting at the 5 prime end with 5' GCTAAGCA 3'. What would be the order the bases would be added to the new strand ?

What is the native climax community in the UK?

Which type of selection is shown by fossils of black bears, showing them becoming bigger during glacial periods ( ice ages)?

In the actual ratio of 6:1:1:6, there were more of the ginger and black eyed hamsters and more of the white with red eyed hamsters than expected. Therefore, there are proportionately fewer of the mixed traits (Ginger and red eyes and white with black eyes). What process allowed those few mixed trait offspring to occur?

In hamsters two genes are autosomally linked : Fur and Eye colour . Where Ginger fur = G, and White fur =g. Black eyes = B and red eyes = b. In a cross between a homozygous recessive male for both traits and a heterozygous female for both traits , what would be the expected ratio of Ginger & Black eye, White and Black eye, ginger and red eye and white with red eyes?

How can you tell from a pedigree (family tree) that a trait is sex linked?

What reduces the concentration of neurotransmitter in a synapse after it has diffused across?

Once an action potential has been generated, what causes the next section of the axon membrane to become depolarised?

Name protein C in the above diagram.

Across a resting human neurone plasma membrane, what is the average potential difference?

How can charged ions cross a plasma membrane?

• a) Simple Diffusion
• b) Facilitated Diffusion
• c) Active Transport

True or False : Taxis is when an organism either moves faster in harsh conditions or turns less in harsh conditions.

This diagram shows part of the nitrogen cycle. Which two processes form nitrification?

If 5 glucose molecules are respired, how many molecules of CO₂ will be produced from Glycolysis, Link reaction and the Krebs cycle?

Name the enzyme that converts A to B.

The splitting of water at PSII creates molecules A & B, what do A and B represent?

Which membrane is represented by 'C' on the diagram?

Name structure E