BSCI 10001 Lecture Notes - Lecture 24: Pribnow Box, Tata Box, Lac Operon
Document Summary
Get access
Related Documents
Related Questions
The TATA-binding protein (TBP) binds to the TATA box sequence in eukaryotic promoters. What is its function in transcriptional initiation?
It blocks access of RNA polymerase to the promoter, until removed by general transcription factors.
It is the subunit of prokaryotic RNA polymerase that is required to recognize promoters.
It modifies histones so nucleosomes can be removed from DNA for transcription.
It bends and partly unwinds DNA at a promoter.
The genetic code is said to be âdegenerateâ because
there are more codons than amino acids. |
there are more amino acids than codons. |
different organisms use different codons to encode the same amino acid. |
some codons specify more than one amino acid. |
Three general mechanisms appear to be responsible for the conversion of proto-oncogenes to oncogenes
overexpression, point mutations, deletions |
inversions, translocations, methylation |
familial, sporatic, phosphorylation |
None of the above account for the conversion of proto-oncogenes into oncogenes |
Transcriptional control of genes that acts by regulating the continuation of transcription is called
induction |
attenuation |
antitermination |
negative inducible control |
The genetic code is fairly consistent among all organisms. The term used to describe this consistency is
redundant |
resilient |
universal |
the central dogma |
The F, G, and H loci are linked in the order written. There are 30 cM between F and G and 30 cM between G and H. If a plant Ff Gg Hh is testcrossed, what proportion of the progeny will be ff gg hh, assuming no interference?
0.7 |
0.3 |
0.245 |
0.15 |
DNA synthesis is always from 5â to 3â because
replication must be continuous |
the strands are antiparallel |
primers lack 3â to 5â exonuclease activity |
none of the above |
The F, G, and H loci are linked in the order written. There are 30 cM between F and G and 30 cM between G and H. If a plant Ff Gg Hh is testcrossed, what proportion of the progeny will be ff gg hh, assuming no interference?
0.7 |
0.3 |
0.245 |
0.15 |
In the ZZ-ZW sex-determination system, if an AaBb female was crossed to an individual of genotype Aa Bb, what is the probability of a female offspring with the two dominant traits given by alleles A and B? Assume A and B are dominant alleles.
1/8 |
1/16 |
9/16 |
9/32 |
1. What is the term when the product of a biochemical pathway inhibits the activity of the first enzyme of a pathway?
feedback inhibition. | ||
activator inhibition. | ||
diffusional regulation. | ||
enzyme activation. |
2. Through control of gene expression, prokaryotes respond to changing __________ conditions.
internal | ||
protein | ||
environmental | ||
genetic |
3. A protein that negatively regulates transcription by binding to the operator is known as the
operon | ||
repressor | ||
activator | ||
inducer |
4. During attenutation, when tryptophan levels are high, the ________ stem-loop forms and transcription ________ the trpL gene.
1-2, ends just past | ||
3-4, ends just past | ||
1-2, continues beyond | ||
3-4, continues beyond |
5. The process of turning on the expression of a gene in response to a substance in the environment is called:
constituation. | ||
repression. | ||
induction. | ||
catabolism. |
6. What is a function of some specific transcription factors?
to bind to the promoter region of the gene to facilitate the proper alignment of the RNA polymerase | ||
to bind to the centromere to induce meiosis | ||
to bind to enhancer regions to help regulate gene transcription | ||
to bind to the operator to recruit sigma factor |
7. How does exposing an E.coli cell to glucose affect the regulation of the lac operon via CAP?
cAMP binds to CAP and transcription is increased. | ||
cAMP binds to CAP and transcription is decreased. | ||
cAMP does not bind to CAP and transcription is increased. | ||
cAMP does not bind to CAP and transcription is decreased. |
8. The lac repressor protein works when mutations in the repressor gene and structural genes are:
in cis or in trans. | ||
in trans only. | ||
in cis only. | ||
in both prokaryotes and eukaryotes. |