DNA replicates before cell division, duplicating chromosomes. This occurs during S stage of interphase! Now each chromosome has two identical double helical models.
It may be a lake, a marsh, a spring or a glacier. This is where the stream starts. The source is the farthest point of the river stream from its estuary or its confluence with another river or stream. ... The farthest stream is called the headstream or headwater.
Air pollution is a type of environmental pollution that affects the air and is usually caused by smoke or other harmful gases, mainly oxides of carbon, sulphur and nitrogen. In other words, air pollution is the contamination of air due to the presence or introduction of a substance which has a poisonous effect.
Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs.
Answer:
not nucleus, only nucleoid
