Question

6. Aminoacyl-tRNA synthetases catalyses _____ 1. DNA replication 2. transcriptional termination 3. the attachment of amino acids to the tRNA molecules. 4. the binding of mRNA to the 30S subunit. 5. the removal of the polypeptide from tRNA in the P site and transferal to the amino acid at the A site 7. If the strand “5'-TACGCCT-3'” is a template strand, what would the mRNA strand look like? 1. 5'-AGGCGUA-3' 2. 3'-AUGCGGA-5' 3. 3'-ATGCGGA-5' 4. 5'-AGGCGTA-3' 5. 5'-UGGCGTU-3' 8. A repressor is a______. 1. regulatory protein that increases the rate of transcription 2. regulatory protein that binds to DNA and inhibits transcription 3. form of positive control. 4. small effector molecule that causes transcription to increase 5. enzyme that converts lactose to allolactose 9. Complete the following statement: When there is lactose in the medium and no glucose, the cAMP concentration is _____. 1. low 2. medium 3. high 4. inhibited by negative feedback 5. negatively regulated 10. Antisense RNA________ 1. carries a codon during translation 2. is a strand of RNA, complementary to a specific mRNA strand. 3. cleaves RNA into fragments 4. functions in the translation of proteins 5. are sequences that increase gene expression

Answer 1

6. Aminoacyl-tRNA synthetases catalyses _____

The answer is- 3. the attachment of amino acids to the tRNA molecules.

Aminoacyl-tRNA synthetases activate the amino acids by covalently linking them to tRNAs. When a tRNA is charged with the amino acid corresponding to its anticodon, it is called amino acyl tRNA.

7. If the strand “5'-TACGCCT-3'” is a template strand, what would the mRNA strand look like?

The answer is- 2. 3'-AUGCGGA-5

RNA polymerase reads the template strand on 3 prime to 5 prime direction. It will like this-

5'-TACGCCT-3' Template strand

3'-AUGCGGA-5 mRNA

3'-ATGCGGA-5 Coding strand

8. A repressor is a_____

The answer is - 2. regulatory protein that binds to DNA and inhibits transcription

Repressor binds to the operator and inhibits RNA polymerase to bind to the promoter.

9. Complete the following statement: When there is lactose in the medium and no glucose, the cAMP concentration is _____

The answer is - 3. high

When there is no glucose in the medium cAMP will be high and cAMP attaches to CAP protein and facilitates transcription of structural genes.

10. Antisense RNA________

The answer is -  2. is a strand of RNA, complementary to a specific mRNA strand.

Antisense RNA are short stretches of RNA complimentary to the mRNA. It regulates gene expression.