Answer:
Organisms depends on physical and biological factors of an ecosystem.
Explanation:
Biological and physical changes cause shift in an ecosystem's populations because the population of organisms depends and greatly affected from the environmental factors such as temperature, moisture etc. These environmental factors causes change in the physical features of an ecosystem so when these changes occur in physical factors, it greatly affected the population of organisms.
Answer:
A = Activator
B = Effector
Explanation:
An activator is a protein which typically binds to a short (50–1500 bp) region of DNA which might be located either upstream (mainly) or downstream of a gene so as to cause increased transcription. This particular region of DNA is known as enhancer and activator is also known as transcription factor. Activator is a trans-acting factor which binds to the cis-acting factor which is enhancer so as to enhance transcriptional expression.
But another protein named as effector may restrict activator from binding to the enhancer leading to a decrease in transcriptional expression by binding to the activator allosterically. Allosteric binding of effector to the activator causes conformational change in activator so it can no longer bind the enhancer.
Answer:
Chemical weathering refers to the weathering of rocks by the use of certain chemicals
Mechanical weathering refers to the weathering of rocks by the application of physical forces or pressure or expansion of size of the rocks.
Explanation:
There are certain chemicals which helps in the decomposition of rock particles by breaking the bonds between rock particles. Feldspar is the example of chemical weathering which occurs when the substance present in the rocks combine with rain water. Due to this, rocks change into clay particles. Mechanical weathering of rocks occur due to the contraction and compression of rock due to change in temperature. Rocks also broken by applying pressure on it.
