Heat-killed S form Streptococcus extract treated with proteases is mixed with live R form Streptococcus cells and injected into living mice. What is most likely to happen?
1. | The mice would live. |
2. | The mice would die. |
3. | The mice's blood would have dead R cells. |
4. | A new strain of Streptococcus will be present in mice. |
The addition of deoxyribonucleotides by DNA polymerase during DNA synthesis is an endergonic process. The source of energy used is:
1. | ATP |
2. | Energy from photons of light |
3. | Entropy created from protein digestion |
4. | The nucleotides themselves |
It is believed that all organisms have arisen from a single distant ancestor. The strongest evidence for this would be:
1. | DNA stores genetic information in all organisms. |
2. | The genetic code is universally a triplet code. |
3. | The amino acids specified by particular triplets are almost always identical between any two organisms. |
4. | The genetic code is degenerate but unambiguous. |
RNA polymerase is able to identify the template strand from the coding strand because of:
1. | promoter | 2. | initiator |
3. | transcription factor | 4. | start codon |
hnRNA from the nucleus of a eukaryotic cell is hybridized with mature mRNA produced from it. Some regions loop out and represent:
1. excised introns
2. exons in the pre-mRNA
3. the poly-A tail in the pre-mRNA
4. introns to be excised later
Wobble" pairing, a property of tRNA, put forth by Francis Crick is largely responsible for:
1. | the redundancy of the genetic code. |
2. | the conservation of the genetic message. |
3. | the large variety of amino acids encoded by the genetic code. |
4. | the excess of different kinds of tRNA that are required for all the amino acids. |
The amino acid sequence for a eukaryotic gene is placed in a plasmid just downstream of a promoter. Which of the following can be the most likely result?
1. | The cell would die because of the antigenicity of the eukaryotic proteins. |
2. | The prokaryotic cell will demonstrate the eukaryotic processes such as splicing. |
3. | An mRNA would form, but would it would be much longer than that formed directly from the template in the original eukaryote. |
4. | If the ribosome could bind the mRNA, a polypeptide that is longer than the one from the original eukaryote would be created. |
Using reverse transcriptase or gene synthesis has an advantage over the shotgun approach in obtaining a copy of the gene required as:
1. | the gene produced can easily be ligated to the vector |
2. | the gene produced is not a split gene |
3. | the gene produced does not require a promoter to be expressed |
4. | the gene produced does not require an ori to replicate |
The promoter site and the terminator site for transcription are located at:
1. | 3' (downstream) end and 5' (upstream) end, respectively of the transcription unit |
2. | 5' (upstream) end and 3' (downstream) end, respectively of the transcription unit |
3. | the 5' (upstream) end |
4. | the 3' (downstream) end |
With regard to mature mRNA in eukaryotes:
1. | exons and introns do not appear in the mature RNA. |
2. | exons appear but introns do not appear in the mature RNA. |
3. | introns appear but exons do not appear in the mature RNA. |
4. | both exons and introns appear in the mature RNA. |