AP bio 14
According to Beadle and Tatum's hypothesis, how many genes are necessary for the pathway above?
2
RNA polymerase moves along with template strand of DNA in the ____ direction, and adds nucleotides to the ____ end of the growing transcript
3' to 5'; 3'
An extra terrestrial life form is discovered. It has a genetic code much like that of organisms on Earth except that there are five different DNA bases instead of four In the base sequences are translated as doublets instead of triplets. How many different amino acids could be accommodated by this genetic code?
32
Choose the answer that has these events of protein synthesis and proper sequence.
4, 1, 2, 5, 3
A peptide has the sequence and NH2-phe-pro-lys-gly-phe-pro-COOH. Which of the following sequences in the coding strand of the DNA code for this peptide?
5' TTT-CCC-AAA-GGG-TTT-CCC
Which point mutation would be most likely to have a catastrophic affect on the resulting protein?
A base deletion near the start of a gene
The function of the ribosome and poly peptide synthesis is to
A, B, C
Which part of an amino acid is attached to tRNA in an aminoacyl tRNA molecule?
Carboxyl group
What are polyribosomes?
Groups of ribosomes reading a single mRNA simultaneously
What is the effect of a nonsense mutation in a gene?
It introduces a stop codon into the mRNA
A ribozyme is an enzyme
Made up of RNA
Using RNA as a template for protein synthesis instead of translating proteins directly from the DNA is advantageous for the cell because
RNA acts as an expendable copy of the genetic material
Which of the following statements are true about proteins synthesis and prokaryotes?
Translation can begin while transcription is still in progress.
A particular triplet of bases in the coding sequence of DNA is AAA. The anti-codon on the tRNA that binds the mRNA codon is
UUU
When translating secretory or membrane proteins, ribosomes are directed to the ER membrane by
a signal-recognition particle that brings ribosomes to a receptor protein in the ER membrane.
Which of the following helps to stabilize mRNA by inhibiting it's degradation?
both C and D
A frameshift mutation could result from
either an insertion or a deletion of a base
Once transcribed, eukaryotic mRNA typically undergoes substantial alteration that includes
excision of introns
A transcription unit that is 8000 nucleotides long may use 1200 nucleotides to make a protein consisting of 400 amino acids. This is the best explained by the fact that
many non-coding nucleotides are present in mRNA
What amino acid sequence will be generated, based on the following mRNA codon sequence? 5' AUG-UCU-UCG-UUA-UCC-UUG 3'
met-ser-ser-leu-ser-leu
If the triplet CCC codes for the amino acid proline in bacteria, then implants CCC should code for
proline
What are ribosomes composed of?
rRNA and proteins
Suppose the following DNA sequence was mutated from 3' AGAGAGAGAGAGAGAGAG 5' to 3' AGAAGAGAGATCGAGAGA 5'. What amino acid sequence will be generated based on this mutated DNA?
ser-ser-leu
Which of the following is least related to the other items?
snRNP
Which of the following is least related to the other items?
translation
