Answer:
Answered below
Explanation:
Cell membranes are barriers which protect and regulate the movement of substances in and out of the cells. It is a semi-permeable and selective structure.
In the passive transport system, substances move along a concentration gradient and it doesn't require energy. The examples of passive transports include; simple diffusion which transports carbon dioxide and oxygen, osmosis and facilitated diffusion which transports charged molecules like ions, sucrose etc.
In active transport, substances move against the concentration gradient. This requires energy. The two main types are: primary active transport, which uses direct metabolic energy e.g Na+/K+ pump, and the secondary active transport system which couples the transported molecules with another molecule moving along the gradient, example the Na+/glucose transporter.
DNA is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).
Nucleotides are the building blocks of nucleic acids; they are composed of three subunit molecules: a nitrogenous base, a five-carbon sugar (ribose or deoxyribose), and at least one phosphate group.
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the for the question is 4
Answer:
Genetic variations that alter gene activity or protein function can introduce different traits in an organism. If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation (a process known as natural selection)
Answer:
The tendency of an animal that helps them from getting detected or observed by other animals is termed as crypsis. The phenomenon can be an antipredator adaptation or a predation strategy. Some of the modes of crypsis are nocturnality, camouflage, mimicry, and subterranean lifestyle.
Flower spider is a species of spider that takes the color of the flower on which it hides. It is a predator, which works as an ambush killer, that is, it waits for the bees to come to the flower so that it can kill it. It is not an illustration of crypsis, the spider in the mentioned case is a predator, and is not hiding from anyone, it just makes it color to resemble the color of the flower so that it can kill its prey.
