Which of the following provides the most accurate definition of a promoter?
DNA sequences that code for the production of polypeptides
DNA sequences that produce RNA molecules
DNA sequences that act as a binding site for RNA polymerase during transcription
DNA sequences that codes for the production of enzymes
Which of the following is not an example of how the external environment can influence gene expression?
Fur colouration of Siamese cats
Petal colour of snapdragons
Skin colouration after sun exposure
Sea turtle eggs hatching as females if incubated at 30°C
Which of the following are examples of groups that could be added to the tails of histones to chemically modify them?
I. and III. only
II. and IV. only
I., II. and III.
II., III. and IV.
Which of the following correctly compares the modification of RNA in prokaryotes and eukaryotes?
| Prokaryotes | Eukaryotes | |
| A. | mRNA can be spliced to remove non-coding sequences | A methylated cap can be added to the 5' end of the mRNA molecule |
| B. | A poly-A tail is added to the 3' end of the mRNA molecule | mRNA does not require modification after transcription |
| C. | mRNA does not require modification after transcription | mRNA can be spliced to remove non-coding sequences |
| D. | mRNA can be spliced to remove non-coding sequences | A poly-A tail is added to the 3' end of the mRNA molecule |
Which of the following best describes the importance of regulating gene expression?
To ensure that essential genes are expressed all the time in the relevant cells
To ensure that only the relevant genes in the relevant cells are expressed at certain times
To ensure that only the relevant genes are expressed in the relevant cells at all times
To ensure that the same group of essential genes is expressed in all cells of the organism at certain times
