Biology, 25.07.2019 05:00 sawyerharper

How much time does the cell exists in interphase

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Answer from: Manuel2019

s phase, or synthesis phase, is the time during which the cell copies its dna in preparation for mitosis. since dna does not exist by itself in the nucleus but is packaged by proteins, new packaging proteins must also be made to wrap the copied dna. these package proteins are called histones.

Answer from: yqui8767

compared to mitosis, the interphase takes a long time because the cell is most active - proteins are synthesized and dna duplicated. that means it takes a lot of energy and time during interphase.

Answer from: Quest

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

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Answer from: Quest

Holozoic nutrition refers to the regular animal nutrition mode whereas saprophytic nutrition refers to the nutrition mode of fungi and bacteria.

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