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Meghna Thapar 5 years, 8 months ago
DNA exists as a double-stranded molecule in nature. The strands are held together by Vander Waals' forces and the purine and pyrimidine bases of the two strands are held together by hydrogen bonding. ... Genetic information is contained in the sequence of mononucleotide of the DNA molecule. DNA has three types of chemical component: phosphate, a sugar called deoxyribose, and four nitrogenous bases—adenine, guanine, cytosine, and thymine. Two of the bases, adenine and guanine, have a double-ring structure characteristic of a type of chemical called a purine. DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). To fit inside cells, DNA is coiled tightly to form structures we call chromosomes.
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Charumathi Thangaraj 5 years, 11 months ago
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Kriti Sharma 5 years, 11 months ago
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Meghna Thapar 6 years ago
Once inside the uterus, the conceptus floats freely for several more days. It continues to divide, creating a ball of approximately 100 cells, and consuming nutritive endometrial secretions called uterine milk while the uterine lining thickens. The ball of now tightly bound cells starts to secrete fluid and organize themselves around a fluid-filled cavity, the blastocoel. At this developmental stage, the conceptus is referred to as a blastocyst. Within this structure, a group of cells forms into an inner cell mass, which is fated to become the embryo. The cells that form the outer shell are called trophoblasts (trophe = “to feed” or “to nourish”). These cells will develop into the chorionic sac and the fetal portion of the placenta (the organ of nutrient, waste, and gas exchange between mother and the developing offspring).
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Meghna Thapar 6 years ago
Homo erectus (Java man) had a considerably larger brain than Homo habilis, fashioned more advanced tools and controlled fire. Better foraging and hunting skills, allowed it to exploit its environment better than Homo habilis. However, an ape man is a hypothetical primate representing a transitional form between true humans and the anthropoid apes, considered by some as constituting the genus Australopithecus.
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Meghna Thapar 5 years, 8 months ago
Some forms of menopause hormone therapy may cause monthly bleeding. This includes cyclic hormone therapy preparations that contain a combination of estrogen and progestin. ... Menopause hormone therapy can result in light bleeding or bleeding that's as heavy as a normal period. Before perimenopause, your estrogen and progesterone levels rise and fall in a consistent pattern during your menstrual cycle. ... During perimenopause, your periods may be Irregular. Rather than having a period once every 28 days, you might get them less or more often. Because your final periods can be irregular, menopause is confirmed 12 months after your last period. ... It is not normal to bleed or spot 12 months or more after your last period. Bleeding after menopause is usually a sign of a minor health problem but can sometimes be an early sign of more serious disease.
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Meghna Thapar 6 years ago
The mechanisms of cell division vary between prokaryotes and eukaryotes. Prokaryotes are single-celled organisms, such as bacteria and archaea. They have a simple internal structure with free-floating DNA. They use cell division as a method of asexual reproduction, in which the genetic makeup of the parent and resulting offspring are the same. One common mechanism of asexual reproduction in prokaryotes is binary fission. During this process, the parent cell duplicates its DNA and increases the volume of its cell contents. Eventually, a fissure emerges in the center of the cell, leading to the formation of two identical daughter cells.
Posted by Yashveer Singh 6 years ago
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Yogita Ingle 6 years ago
ALGAE
- Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic plants.
- They occur in moist stones, soils, and wood or in association with fungi and animals.
Example-1. Lichen is the association of algae with fungi.
- Algae grow on the body of sloth bear.
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