The cell membrane is also called selectively permeable membrane for the sole reason being it is selective in nature.
It forms a physical barrier and as a barrier between the cell and the external environment as it allows only selected necessary molecules to pass through it and at the same time prevents entry of unwanted / unnecessary substances.
It also regulates the entry and exit of molecules into and out of the cell.
The cell membrane permits the entry of vital molecules like
<span>water, oxygen, amino acids and glucose into the cell as they are crucial for various life processes and at the same time metabolic waste products are expelled through the cell membrane.</span>
Answer:
1. A 2.B 3.B 4.C 6.A 7.B 8.C 9.D
Explanation:
It's phase contrast microscopy
Because you need to contrast to see the specimen
A. because you should always wash your hands after touching any body fluids or contaminated items, regardless of whether gloves are worn.
Answer:
Plants, animals and other organisms that live in deserts have evolved to survive harsh conditions, scarce water and barren landscapes. ... This desertification is exacerbated by human exploitation of ecosystems that border deserts, causing land degradation, soil erosion and sterility, and a loss of biodiversity.Explanation:
