The cell membrane is a lipid bilayer that prevents that passage of water and ions. This allows cells to maintain a higher concentration of sodium ions out the outside of the cell.
Answer:
Stratum basale layer of epidermis produces melanin pigment.
Explanation:
The epidermis is composed of mainly four layers. In some areas like palm and foot, they contain five layers - stratum granulosum. All the layers are avascular i.e. lack of blood vessels.
The stratum basale cell is the deep layer of the epidermis. It is a single layer made of basal cells. The basal layer produces the keratinocytes. The keratinocytes divide mitotically and migrate to the upper layers. The keratinocytes provide hardness to the nail and skin, also make the skin waterproof.
Another two types of cells are present in the stratum basale - Merkel cell and melanocyte cell. Merkel cells provide sensory stimulation to the skin. Melanocyte cell produces pigment melanin.
Melanocyte gives color to skin, hair. It spreads from stratum basale to the upper layer of the skin called stratum corneum. Melanin pigment protects the skin from the ultraviolet radiation of the sun.
Answer: Accessory pigments
Explanation:
The wide range of colors in algae is produced by the accessory pigments. These compounds in the plants assist in the absorption of the light during the process of photosynthesis.
They are helpers and assist the chlorophyll in absorption of light. Red algae has an accessory pigment known as phycoerythrin as the accessory pigment which absorbs red colored light which gives red algae red color.
This does not means that algae does not have chlorophyll, it does have but the pigments mass the effect of chlorophyll.
<span>The answers are: mitochondria, lysosome, endoplasmic reticulum</span>
Answer:
Mitosis
Explanation:
The second stage Mitosis, It is the process in cell division where the nucleus divides into two nuclei.
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