Biology Ch 13

RNA polymerase binds to the promoter sequence in RNA. True False

False

Reverse transcriptase catalyzes the synthesis of DNA from an RNA template True False

True

Saved The poly-A tail is thought to facilitate the export of mRNA from the nucleus. True False

True

The molecule that connects a growing polypeptide chain and mRNA is called: a ribosome RNA polymerase. tRNA rRNA

tRNA

RNA synthesis is also know as elongation translation transcription termination

transcription

The template DNA strand is described as being parallel to the complementary RNA strand. True False

false

Molecular chaperones assist in the folding of newly synthesized mRNAs. True False

false

The total number of different three base combinations of the four nuclei acid bases is -16 -256 -64 -20

20

A sequence of bases located upstream from a reference point occurs toward the: 5′ end of the mRNA sequence carboxyl end of the amino acid sequence 5′ end of the transcribed DNA strand 3′ end of the mRNA sequence

5' end of the mRNA sequence

A(n) nonsense mutation is a base-pair substitution that results in the replacement of one amino acid with another. True False

False

The process in which RNA is synthesized using a DNA template is called translation. True False

False

Which of the following is a characteristic of uracil? It contains two nitrogenous rings. It has the ability to bond with cytosine It has the ability to bond with adenine. It has the ability to bond with guanine.

It has the ability to bond with adenine

A grouping of three nucleotides codes for one amino acid. True False

True

Uracil forms a complementary pair with ____ in RNA and ____ in DNA thymine; thymine adenine; adenine adenine; thymine thymine; adenine

adenine; adenine

The wobble hypothesis states that -some amino acids are coded for by more than one codon -certain tRNA anticodons can pair with more than one codon sequence -an amino acid may be linked to more than one type of tRNA molecule -more than one ribosome can bind to an mRNA molecule

certain tRNA anticodons can pari with more than one codon sequence

In eukaryotes, the initiator tRNA carries the amino acid leucine. true false

false

Which of the following is made from DNA? rRNA only mRNA, tRNA, and rRNA tRNA only mRNA only

mRNA, tRNA, and rRNA

RNA is ____ and contains the nitrogenous base ____, which is absent in DNA. single stranded; thymine single stranded; cytosine single stranded; uracil double stranded; uracil

single stranded; uracil

If an mRNA transcript of the human XYZ gene was introduced into a yeast cell, the transcript would be: transcribed into the XYZ mRNA exported outside the cell. translated into the human XYZ protein. translated into a yeast-specific gene.

translated into the human XYZ protein