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The body cavity of many invertebrates, including arthropods and molluscs, developed from part of the blood system.
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Nucleic acid sequence of bases that can form a double- stranded structure by matching base pairs. For example, the complementary sequence to C-A-T-G (where each letter stands for one of the bases in DNA) is G-T-A-C. Complementary DNA (cDNA) is the DNA produced on an RNA template by the action of reverse transcriptase (RNA-dependent DNA-polymerase). The sequence of the cDNA becomes complementary to the RNA sequence. In nature complementarity is the base principle of DNA replication and transcription as it is a property shared between two DNA or RNA sequences, such that when they are aligned antiparallel to each other, the nucleotide bases at each position in the sequences will be complementary.
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The nucleus is a large, centrally located spherical cellular component. It is bounded by two nuclear membranes, both forming a nuclear envelope. The nuclear envelope separates the nucleus from the cytoplasm. Within nucleoplasm two types of nuclear structures are embedded – the nucleolus and chromatin material. The nucleolus may be one or more in number and is not bounded by any membrane. It is rich in protein and RNA molecules and acts as the site for ribosome formation.The nucleus contains chromosomes, which are visible as rod-shaped structures only when the cell is about to divide. Chromosomes contain information for inheritance of features from parents to next generation in the form of DNA (Deoxyribo Nucleic Acid) molecules. Chromosomes are composed of DNA and protein. DNA molecules contain the information necessary for constructing and organising cells. Functional segments of DNA are called genes. Thus, genes are the functional units of chromosomes which transmit the heredity information from parents to offsprings. These are located on chromosomes.
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Gastric pits are indentations in the stomach which denote entrances to 3-5 tubular shaped gastric glands. They are deeper in the pylorus than they are in the other parts of the stomach. The human stomach has several million of these pits which dot the surface of the lining epithelium. Parietal cells (also known as oxyntic or delomorphous cells) are the epithelial cells that secrete hydrochloric acid (HCl) and intrinsic factor. These cells are located in the gastric glands found in the lining of the fundus and in the cardia of the stomach.
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Dentition pertains to the development of teeth and their arrangement in the mouth.
Most adults have 32 teeth, called permanent or secondary teeth:
- 8 incisors.
- 4 canines, also called cuspids.
- 8 premolars, also called bicuspids.
- 12 molars, including 4 wisdom teeth.
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1) ICBN - International Code of Botanical Nomenclature
2) ICZN - International Code of Zoological Nomenclature
3) ICNC - International Code of Nomenclature for cultivated plant
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When the cells are arranged in two embryonic layers, the animal is called a diploblastic animal. The two layers are; ectoderm and endoderm. Mesoglea; which is an undifferentiated layer is present between the ectoderm and endoderm. Example: coelenterates.
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Yogita Ingle 6 years, 6 months ago
A tendril is a specialized stem,leaf with a threadlike shape that is used by climbing plants for support and attachment, generally by twining around whatever it touches. They do not have a lamina or blade, but they can photosynthesize. They can be formed from modified shoots, modified leaves, or auxiliary branches.
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