Answer:
Each cell expresses, or turns on, only a fraction of its genes. The rest of the genes are repressed, or turned off. Signals from the environment or from other cells activate proteins called transcription factors. These proteins bind to regulatory regions of a gene and increase or decrease the level of transcription.
Explanation:
Abstinence is the only guaranteed way to avoid pregnancy.
The best answer is D. He extracted and observed DNA from white blood cells. He is a Swiss physician and a biologist who is known to be the first researcher to identify nucleic acid. He isolated various phosphate-rich chemicals , which he called nuclein or what we know now as nucleic acid, from white blood cells' nuclei which paved the way for him to discover and identify DNA.
Answer:
One of the lymphatic system's primary jobs is to collect excess fluid (particularly lymph fluid) surrounding the body's tissues and organs and return it to the bloodstream.
Explanation:
If the lymphatic system didn't drain excess fluid from the tissues, the lymph fluid would build up in the body and cause swelling. hope this helps!
Which effect is a result of the Hadley circulation cells?
Answer:
Air moving toward the equator Is My Answer!
Explanation:
The movement of air in the Hadley cell results in the formation of the trade winds moving from the northeast toward the west in the Northern Hemisphere at the equator.
Hope this helps!!