When glucose is high, camp is low : cap doesn't bind the lac operator, and RNA polymerase doesn't bind the lac promoter.
Explanation:
The lac operon is a molecule responsible for the rapid transport of lactose in Escherichia coli, mainly, but it can be found in other bacteria. This molecule is essential to regulate several factors within the bacterial cell, however the main factor regulated by it is the availability of glucose and lactose in the environment. WWhen glucose is high, camp is low: cap doesn't bind the lac operator, and rna polymerase doesn't bind the lac promoter.
When glucose is high, cAMP is low; CAP does not bind the lac operator, and RNA polymerase does not bind the lac promoter. CAP is only active when glucose levels are low, which means the cAMP levels are high, and therefore the lac operon can only be transcribed at high rate when glucose is absent. The importance of this is that the bacteria only turns on the lac operon and start using lactose only after they have used up all the preferred energy source which is glucose.
In the deep waters of the ocean, coral reefs are found in abundance. Algae live on these coral reefs, providing nutrition and producing pigments that give color to the corals. The corals offer shelter to the algae. So, they share a symbiotic association. Climate change has led to increased temperatures and has caused the corals to throw away the algae living inside them. This action causes the corals to be bleached because of a lack of pigment. This change will lead to coral bleaching. The corals will die of lack of nutrition with time.
A) density dependentB) density independentC) population dependentD) population independent
The answer is: B. DENSITY INDEPENDENT
Density independent is a limiting factor. It affect birth and death rates of organisms through abiotic and environmental factors. A forest fire is one of the environmental factors that affects the density of a species in a given location.
Mutualism describes the ecological interaction between two or more species where each species has a net benefit. Mutualism is thought to be the most common type of ecological interaction, and it is often dominant in most communities worldwide.
