The correct answer is true.
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.
ecosystem
biome
none of the above
B) with phosphodiester bonds connecting sugars and phosphate groups
C) with hydrogen bonds connecting complementary sugars
D) with ionic bonds between sugars and phosphate groups
The complementary strands of DNA are held together through hydrogen bonds that connect the complementary bases. Adenine pairs with thymine, and cytosine pairs with guanine. Phosphodiester bonds connect the sugars and phosphate groups along each strand, but they do not bind the complementary strands together.
The complementary strands of DNA are held together predominantly through hydrogen bonds that connect complementary bases. Among the four types of bases in DNA, adenine (A) always pairs with thymine (T) through two hydrogen bonds, and cytosine (C) always pairs with guanine (G) via three hydrogen bonds. Therefore, the correct answer is Option A) with hydrogen bonds connecting complementary bases. Option B is incorrect because phosphodiester bonds connect the sugars and phosphate groups along each backbone of a DNA molecule, but they don’t bind the complementary strands together. Option C and Option D are also incorrect as neither sugars nor ionic bonds play a substantial role in holding the complementary strands of DNA together.
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c. placenta
b. follicle
d. uterus
Answer:
The correct answer is - humpback whales →sea turtles→humans→dolphins.
Explanation:
The hearing of sound is measured in hertz which is the unit of the sound that depends on the different frequencies of individual produce. The range of hearing sound is different in different animals.
Humpback whales produce sound between 30 to 8000 Hz however whales sense the vibration made by their song or sound by another whale. Sea turtles are able to hear in between the 20 to 1000 Hz whereas humans are able to hear 20 to 20000 Hz.
The highest hearing range of the sound is by dolphins from giving options as they are able to hear sound between 40 to 130000.
Thus, the correct answer is- humpback whales →sea turtles→humans→dolphins.