Biology Year 13 Random Retrieval

Which enzyme do we use to convert mRNA into cDNA?

Can extra methylation be removed from the DNA?

What word describes the inner cell mass now?

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 anti-codon at the bottom. The tRNA anticodons then complementary base pair with the mRNA codon. In the ribosome there are 3 binding sites for tRNA, two where a peptide 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.

TTA = Leu TTG = Leu TTC = Phe TCA = Ser TAA = Stop What would be the order of amino acids in a polypeptide coded from this sequence?

TTCTTGTTATCATAA

Which direction can DNA polymerase only extend the new strand of DNA?

A group of organisms of the same species living in a particular area at a particular time' is the definition for what?

In guinea pigs, Short hair (S) is dominant to long hair (s). In a monohybrid cross between a heterozygous mother, with a heterozygous father, what ratio of long hair to short hair will the offspring have ?

What is the definition of 'allele'?

Which of the above diagrams represents the myofilaments a 'Z line' in muscle?

The image above shows a muscle fibre. Name organelle A

True or False - Axons with a narrower diameter have a faster speed of conduction.

What has happened at stage 5?

True or False : Kinesis is a directional response to a stimulus.

In root tips growing parallel to the soil, where will the highest concentration of IAA be found ?

The above diagram shows the Phosphorus cycle. Name type of organism which carries out process A?

Using the ETC, how many molecules of ATP can each reduced FAD generate?

How many molecules of C are required to produce one molecule of glucose?

Why can it be advantageous to a plant for more of process 'G' to occur?

Name structure B