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TLS Online TPP Program
#Question id: 20328
#Unit 4. Cell Communication and Cell Signaling
Acyl-homomserine lactones (AHLs) are auto-inducers used by Gram-negative bacteria to communicate. Which statements are about that Quorum sensing signaling in bacteria.
a. transcription is activated at low cell density
b. transcription is not activated at low cell density
c. transcription is activated at high cell density
d. transcription is not activated at high cell density
e. Upon reaching a threshold concentration, AHL can bind to its receptor LuxR.
f. Upon reaching a threshold concentration, AHL can bind to Lux box.
TLS Online TPP Program
#Question id: 4545
#Unit 3. Fundamental Processes
Through which signal transduction pathway- controls the activators such as Jun, one of the activators that works at the interferon-beta enhancer
TLS Online TPP Program
#Question id: 4171
#Unit 3. Fundamental Processes
Use the table below to determine which template strand DNA sequence (written in the 5ʹ → 3ʹm direction) specifies the tripeptide with the sequence gly-ala-leu.
TLS Online TPP Program
#Question id: 772
#Unit 1. Molecules and their Interaction Relevant to Biology
MicroRNAs:
TLS Online TPP Program
#Question id: 15149
#Unit 8. Inheritance Biology
In this problem we will explore some of the many ways that mutations in two different genes can interact to produce different Mendelian ratios. Consider a hypothetical insect species that has red eyes. Imagine mutations in two different unlinked genes that can, in certain combinations, block the formation of red eye pigment yielding mutants with white eyes. In principle, there are two different possible arrangements for two biochemical steps responsible for the formation of red eye pigment. The two genes might act in series such that a mutation in either gene would block the formation of red pigment. Alternatively, the two genes could act in parallel such that mutations in both genes would be required to block the formation of red pigment.
Further complexity arises from the possibility that mutations in either gene that lead to a block in enzymatic activity could be either dominant or recessive. If the crosses is made between a wild type insect with red eyes and a true breeding white eyed strain with mutations in both genes. Such considerations yield the Pathways in series with recessive mutations in both genes, what will be the phenotype in F1 progeny?