The appropriate response is Nitrogenous Base. It is just a nitrogen containing atom that has an indistinguishable concoction properties from a base. They are especially vital since they make up the building pieces of DNA and RNA: adenine, guanine, cytosine, thymine and uracil.
Answer:
Urbanization has environmental and economic advantages for humans, but also substantial disadvantages, including increased problems with physical and mental health/stress, a modified climate, water and energy management, and air pollution.
Scientists
can also glimpse the awful effects of Alzheimer's disease when they look at
brain tissue beneath the microscope:
Alzheimer's tissue has numerous fewer nerve
cells and synapses than a well brain.
<span>
<span>Plaques, unusual
clusters of protein particle, which are construct up between nerve cells.</span>
</span>
<span>
<span><span>Dead and dying nerve cells contain tangles,</span> which
are produce of twisted strands of a further protein.</span>
</span>
<span>Scientists
are not absolutely sure what causes cell death and tissue deficiency in the
Alzheimer's brain, but plaques and tangles are key suspects.</span>
Answer:
1. C
2.C
Explanation:
I've seen these questions before on a test from my school
Answer:
Cell membranes are selectively permeable which means it allow certain molecules to move across it into and out of the cell. Cells need to be able to transport these substances to live and grow.
Transport of ions, water maintains the osmotic pressure of the cell. Transport of sugars like glucose is necessary to generate energy for the metabolic activities of the cell. Gases like CO2 are waste products of metabolic reaction which are removed by the cell through the cell membrane. Amino acids are required to make proteins.
Transport across cell can occur through active and passive transport and transport of these substance are necessary for a cell to live and function properly.