Answer:
Some viruses attack animal cells. They attach themselves to the host cells and inject the genetic material, which in turn produces new Q-viruses in the host cells. The viruses either have RNA or DNA as their genetic material.
Explanation:
Answer: Option A
Explanation:
The opening and closing of the voltage gated channels depends on the type of the receptors on it. The cells responds according to the receptors found on the cell membrane.
According to the voltage gated channels the domains that are sensitive towards the gated channels are he particular neurotransmitter can have different receptors on them.
An excitatory postsynaptic potential causes channels to move in and shows excitatory response.
Whereas in case of the Inhibitory postsynaptic potential the channels are closed and they show inhibitory response.
Hence, some of the channels remains closed and some of them remains open after signals.
Answer:
yes they are called chloroplast i believe
Explanation:
Answer:
Quaternary
Explanation:
The Quaternary period which began around 2.6 million years ago or 2,588,00 years ago is known as the Age of humans.
During this period, the tectonic planets are in a place they are today but the climate was cold and ice glaciers started retreating.
During this period, the evolution of mammals reached on peak and the hominid lines began to evolve as the fossils of the first human belonged to this period. Homo erectus for the first time appeared at the beginning of this period and then evolved later into modern humans after they travelled to Europe and Asia.
Thus, Quaternary is the correct answer.