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Loading and Unloading of Sieve Tubes
In order to understand the loading of food from manufacturing leaf cells to sieve tubes we must examine the anatomy of a minor vein shown in Figure. We can see
Figure: A cross-section of a minor leaf vein. (MC-Mesophyll Cell, XE -Xylem Elements, SE-Sieve Element, TC-Transfer Cells, PP-Phloem Parenchyma cell.
a xylem vessel (X), two sieve elements (SE) which are relatively smaller than other cells and without cytoplasm, the modified companion cells or transfer cells (TC) with dense cytoplasm and phloem parenchyma (PP) which is less dense and vacuolated.
a - HELIX In this intra molecular hydrogen bonds are present The polypeptide chain is spirally coiled, generally in a clock-wise or right handed fashion. Glycine
Highly active antiretroviral therapy (HAART) - The treatment of HIV infection requires combination therapy known as highly active antiretroviral therapy (HAART) along with inte
P ANCREAS It is an elongated, leaf like, yellowish or orangish in colour. Lying partly behind stomach. 16 cm long, 2.5 cm. wide & weight about 60 gms. It consists of hea
What is the neurotransmitter of the neuromuscular junction? How does the nervous system trigger muscle contraction? The nervous cells that trigger the muscle contraction are th
a) Mention the name of the causal organism, symptoms and the mode of transmission of the disease Amoebiasis b) Mention the property that enables the explants to restore into a n
Ram Ventilation Some fish do not use pumping action for gill ventilation. It has been known for long that large tunas cannot be kept alive in captivity unless they are put in
Consider a simple spherical model cell that consists of cytoplasm and a plasma membrane. The cell's initial volume is 2 nL and contains 0.2 M protein. The cell is placed in a la
Define Elongation phase - mechanism of protein synthesis? Elongation: RNA polymerase moves along the DNA and sequential synthesizes the RNA chain. There is the repeated cycle o
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SPINAL CORD (MYELON) It is part of CNS. 45 cm long (in woman 43 cm) & weight 35 gms. Origi n from lower part of medulla oblongeta. Shape - Long cylindrical,
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