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In response to a Wnt signal, β-catenin enters the nucleus and binds to the LEF1/TCF proteins by displacing which one of the following proteins? (1) CBP (2) GSK3 (3) Groucho (4) NEMO The correct answer is: (3) Groucho Explanation: In response to a Wnt signal, β-catenin enters the nucleus and binds to the LEF1/TCF family […]
5. The essential mineral required for cell adhesion molecule, cadherin is? (1) calcium (2) magnesium (3) Iron (4) Sodium Introduction: Cell Adhesion and Cadherin Cell adhesion molecules (CAMs) are proteins that facilitate the binding of cells with each other and the extracellular matrix, playing pivotal roles in tissue formation and maintenance. Among these, cadherins […]
A bacterial response regulator turns on gene A in its phosphorylated form. The amount of “A” shows a sharp and sleep rise at a threshold concentration of the signal sensed by the cognate sensor. This is most likely due to (1) increased phosphatase activity of the sensor at the threshold concentration (2) decreased phosphorylation of […]
79. Which one of the following amino acids is characteristics of and is conserved in response regulator of plant two component systems? (1) Aspartic acid (2) Glutamic acid (3) Tyrosine (4) Histidine Conserved Amino Acid in Plant Two-Component System Response Regulators: Aspartic Acid Introduction Plant two-component systems (TCS) are crucial signaling pathways that allow plants […]
78. Bacterial two component system includes (1) Sensory kinase and response regulator (2) Sensory kinase and Phosphotransferase (3) Signal and receptor (4) Stimulus and response Bacterial Two-Component System: Sensor Kinase and Response Regulator Introduction The bacterial two-component system is a fundamental mechanism for sensing and responding to environmental changes. It enables bacteria to adapt quickly […]
Smooth movement of bacteria during chemotaxis is due to (1) Due to tumbling (2) Phosphorylation of Chey (3) Movement of H+ across plasma membrane (4) Phosphorylation of Che A Smooth Movement in Bacterial Chemotaxis: The Role of Flagellar Rotation Understanding Bacterial Chemotaxis Bacteria move toward attractants or away from repellents through a process called chemotaxis. […]
Bacteria propels with the help of (1) Actin like MreB proteins (2) Tubulin flagella (3) Flagellin Flagella (4) Changes in cytoskeleton How Do Bacteria Propel Themselves? Understanding the Role of Bacterial Flagella Introduction Bacterial motility is a vital trait that allows cells to navigate their environment, move toward nutrients, and escape harmful conditions. The primary […]
It has been observed the bacteria secretes toxin at high population density to check the population size. This phenomenon is termed as (1) Quorum sensing (2) Population control (3) Allelopathy (4) Inter specific Competition Quorum Sensing: Bacterial Communication and Population Control Introduction Bacteria possess sophisticated mechanisms to sense and respond to their environment. One of […]
74. Which sporulation bacteria possess cell-cell communication mechanism that allows bacteria to coordinate physiological processes in response to cell density? (1) Actinomycetes (2) Bacillus subtilis (3) Cyanobacteria (4) Archeabacteria Sporulating Bacteria and Cell-Cell Communication: Role of Quorum Sensing in Bacillus subtilis Introduction Cell-cell communication in bacteria, particularly during sporulation, is crucial for coordinating complex physiological […]
In a laboratory experiment it was observed that both ‘Virus A’ and ‘Virus B’ could infect a mammalian host cell, when infected individually. Interestingly, if the cell were first infected with Virus A (with large MOI), Virus B failed to infect the same cell. If the Virus B (with large MOI) is added first followed […]
