Answer:
D) presence of transcription activators or repressors
Explanation:
The reason why this is not post-transcriptional regulation is that activators actually start the process of transcription by binding to specific sites. while on contrary when repressor binds it halt the process.
For example, there is a protein called CAP which in the presence of cAMP bind with promoter region and enhances the activity of RNA polymerase . While in the absence of cAMP it can not bind to promoter hence the transcription stooped.
Mutations can occur before, during, and after mitosis and meiosis. If a mutation occurs in cells that will make gametes by meiosis or during meiosis itself, it can be passed on to offspring and contribute to genetic variability of the population
Answer:
un ser vivo se define por que tiene un periodo de vida
Explanation:
One species is nocturnal, and the other species is not.
http://quizlet.com/51808791/biology-1407-ch-24-flash-cards/
Answer: the three types of freshwater are swamp,bog and marshes
Explanation: similarities between them
They are all covered with shallow layers of water during some or all of the year.surface water comes from streams,rivers,lakes,ponds and oceans and the Earth's surface.
Difference between them
Bogs are found in cooler northern areas,tends to be acidic and contain many mosses
Swamps are many trees and shrubs and are found in the warm and humid southern United State
Marshes are usually grassy
