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.
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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.
c. Pollinator attraction
b. Breeding
d. Sexual selection
Answer:
pollinion atraction
Explanation:
true or false
b. haploid.
c. monoploid.
d. polyploid.
Answer:
The correct answer is a. diploid.
Explanation:
Gametes are haploid entity which contains one genome or one complete set of chromosome a particular organisms. Gametes are represented by (n) and are produce as a result of meiosis in the germ cells during gametogenesis. Fusion or fertilization of a male and a female gamete results into one celled structure called zygote. The zygote receives two genomes one each from a male gamete and a female gametes. Thus, a zygote contains two sets of chromosomes. ( n+n) = 2n or diploid.
Answer:
Convection
Explanation:
Answer:
Pachytene of prophase I of meiosis I
Explanation:
Crossing over is the process of exchange of genetic material between non-sister chromatids of homologous chromosomes. It occurs during the pachytene stage of prophase I of meiosis I. During pachytene, the paired homologous chromosomes exchange genetic material between themselves and add new gene combinations to the daughter cells.