CH7 post midterm

Question 1

unordered tetrads

Answer 1

ascospores not arranged in any particular order within the tetrad

Question 2

ordered tetrads

Answer 2

ascospores rearranged in the ascus according to the order in which they were created in meiotic divisions

Question 3

central dogma of biology

Answer 3

information stored in DNA is transferred to RNA molecules during transcription and to proteins during translation

Question 4

RNA important modifications

Answer 4

addition of 5’ cap, addition of 3’ polyA tail, excision of introns

Question 5

introns

Answer 5

non-coding sequences that interrupt coding sequences

- present in pre mRNA

Question 6

Exons

Answer 6

Sequences that remain in the mature mRNA after splicing

Question 7

alternative splicing

Answer 7

produce different mRNA’s from the same primary transcript

Question 8

Sometimes RNA editing changes the information content of genes by

Answer 8

• changing the structure of individual bases

- inserting or deleting uridine monophosphate residues

Question 9

translation

Answer 9

genetic information in mRNA is translated into amino acid sequences of polypeptides according to the specifications of the genetic code

Question 10

TRNA’s

Answer 10

mediate the translation of mRNA codons to amino acids

Question 11

Translation initiation

Answer 11

begins when the small ribosomal subunit attaches to the cap and moves to the translation initiation site

Question 12

translation elongation

Answer 12

large ribosomal subunit attaches to form the p site and a site

Question 13

termination

Answer 13

when a stop codon is encounted a release factor enters the a site