University of Illinois Urbana-Champaign MCB 150 Exam 2 |
Questions with 100% Verified Answers | Latest Update
Question:
What kind of molecule is the "adapter" that couples amino acid sequences to the sequence of bases
in the mRNA? (see 17.4)
Answer:
RNA. tRNA transfers amino acids from RNA to the lengthening polypeptide chain.
Question:
Taking into account the wobble hypothesis, which of the following mRNA sequences could be bound
to the tRNA anticodon 3' GGC 5'?
Answer:
5' CCA 3'
Question:
What does a bacterial RNA polymerase produce when it transcribes a protein-coding gene?
Answer:
mRNA
Question:
Which is the best description of the loops in a tRNA molecule?
Answer:
Regions of the molecules that remain as single-stranded RNA due to the absence of complementary
base pairs. The noncomplementary base pairs do not bind to each other and thus result in the
formation of loops.
Question:
Proteins are made up of 20 different amino acids. How many fewer amino acids would have to be
used in order to have the genetic code be made up of two-letter words?
Answer:
4. Sixteen amino acids would require a genetic code with words having a minimum of two
letters from a pool of four different letters.
Question:
How many different amino acids would be found in a polypeptide made from translation of an RNA
containing only cytosines (C) and adenines (A) in random order?
Answer:
6. The amino acids are proline (CCC, CCA), histidine (CAC), threonine (ACC, ACA),
glutamine (CAA), asparagine (AAC), and lysine (AAA)
Questions with 100% Verified Answers | Latest Update
Question:
What kind of molecule is the "adapter" that couples amino acid sequences to the sequence of bases
in the mRNA? (see 17.4)
Answer:
RNA. tRNA transfers amino acids from RNA to the lengthening polypeptide chain.
Question:
Taking into account the wobble hypothesis, which of the following mRNA sequences could be bound
to the tRNA anticodon 3' GGC 5'?
Answer:
5' CCA 3'
Question:
What does a bacterial RNA polymerase produce when it transcribes a protein-coding gene?
Answer:
mRNA
Question:
Which is the best description of the loops in a tRNA molecule?
Answer:
Regions of the molecules that remain as single-stranded RNA due to the absence of complementary
base pairs. The noncomplementary base pairs do not bind to each other and thus result in the
formation of loops.
Question:
Proteins are made up of 20 different amino acids. How many fewer amino acids would have to be
used in order to have the genetic code be made up of two-letter words?
Answer:
4. Sixteen amino acids would require a genetic code with words having a minimum of two
letters from a pool of four different letters.
Question:
How many different amino acids would be found in a polypeptide made from translation of an RNA
containing only cytosines (C) and adenines (A) in random order?
Answer:
6. The amino acids are proline (CCC, CCA), histidine (CAC), threonine (ACC, ACA),
glutamine (CAA), asparagine (AAC), and lysine (AAA)
