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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.
Q. What are the cells responsible for the production of antibodies? The cells that produce antibodies that is the cells of the humoral immune system are the B lymphocytes (B ce
Synthesis of citratefrom acetyl CoA and oxaloacetate: Citrate synthase catalyses this aldol condensation reaction with the release of CoA. There are certain inhibitors to this re
are viruses cellular organisms
Determine what the abnormal levels of AFP signal Abnormal levels of AFP may signal the following: Open neural tube Defect (ONTD) Down syndrome Other chromosoma1
What is Radiographic Template Radiographic Template : You should always use it while taking a panoramic radiograph of the patient. It is done to counter the effect of magnific
How much Fats should be taken for management of obesity? Fats, being a concentrated source of energy need to be restricted. Excess dietary fat promotes much more weight gain th
Q. What do you mean by Bleeding Index? This factor is applicable at this stage to evaluate the health of one stage implants in which the transmucosal component allows the forma
Q. Are nematodes triploblastic or diploblastic animals? Just like platyhelminthes, nematodes are triploblastics that is they present three germ layers (ectoderm, endoderm and m
Q. Differentiate between sterilization and disinfection? 1) Sterilization is defined as freeing the object or substance from all life of any kind. It is the process by which a
There are many characteristics of the ideal drug candi-date. One of these is that its pharmacokinetics should meet its intended use. Many potentially useful drug can-didates, howev
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