The cell membrane is also called selectively permeable membrane for its composition, it is composed of amphipathic lipid, protein and small amount of cholesterol which form a bilayer structure allow only specific substance.
The cell membrane is a thin selectively semi-permeable membrane and act as an outer covering surrounding cell cytoplasm, Proteins and lipids are the major components.
The major lipids are phospholipid, which form a semi-permeable lipid bilayer which have both hydrophilic or water loving head group and hydrophobic or water hating tail group and form bilayer structure.
Hence both group can interact with polar and non polar molecule individually called as amphipathic in nature, Some organelles like nucleus and mitochondria also have its own cell membrane.
The proteins are peripheral, extrinsic and intrinsic type and the function of cell membrane is to protect the cell and maintain the structural integrity of the internal environment of the cell.
Learn more about cell membrane, here:
#SPJ2
.
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
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.
Answer:
The correct answer would be producers as they convert light energy to chemical energy by photosynthesis.
Explanation:
The food chain is a sequence of transfer of energy and food to one organism is consumed by the other.
Trophic level is the position or the place of organisms share in the food chain. Producers are the trophic level placed in the bottom of the food chain.
Producers (plants) convert light energy into chemical energy by the process of photosynthesis. This chemical energy transfer from one trophic level to another. Producers provide food and energy to other trophic levels when they consume producer as their food. The green plants and blue-green algae are the examples of producer trophic level.
Thus, the correct answer would be producers.
Answer: The frequency of the recessive allele increases
Explanation: The HbS gene is a variant of the B-globin gene which is responsible for sickle hemoglobin. There is a recessive disorder called sickle cell anemia that is caused by someone having two recessive alleles. When there's an outbreak of Malaria the frequency of the recessive allele of the HbS gene increases because people that are heterozygous have the advantage due to the fact they have normal and sickle hemoglobin so they are more resistant to malaria because malaria will only take action on normal hemoglobin.
I hope that helps you :)
There are a few difference between primary and secondary succession. One of the differences is the secondary successions begins on soil and primary succession begins on newly exposed surfaces. The correct answer is B.
a.) DNA is a protein and RNA is a nucleic acid.
b.) DNA uses deoxyribose and RNA uses ribose.
c.) DNA has adenine and RNA has thymine.
d.) DNA has thymine and RNA has uracil.