Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Pollen Biology
Fluorescence microscopy coupled with biochemical analysis has helped resolve the differential activity of the enzyme, β-l, 3- glucanase that catalyses the dissolution of callose. The enzyme activity is relatively low during the first meiotic division but reaches its peak at the time of spore release. This sequence of events controlling the enzyme activity is important, as an early dissolution of callose may lead to sterility. Use of autoradiographic and fluorochromatic techniques demonstrated the reduced permeability of the callose wall and the resultant chemical isolation of microspores.
A combination of phase-contrast and fluorescence microscopy also revealed that the callose wall during exins formation serves as a mold or template. Factors that trigger the onset and regulation of meidsis in anther and ovule can be worked out by employing labeled reagents. Biochemical studies through isoenzyme markers have already demonstrated specific stages of meiotic process. There is an increase in the activity of acid phosphatase at zygotene, followed by subsequent decline. At pachytene, marked activation of endonucleases is recorded. Isoperoxidases serve as markers in normal pollen development in Mercurialis annua.
What does Balanced Diet means Balanced Diet means diet which contains a variety of foods in such quantities and proportions that the need for energy, proteins, vitamins, minera
Define the Structure of D and L isomerism? The prefix D or L are used to refer to the configuration of the carbon next to the primary alcoholic group or in other words, the con
What is the excitation threshold of a neuron? How does this threshold relate to the "all-or-nothing" rule of the neural transmission? The excitation threshold of a neuron is th
Subtropical rain forests - Ecosystem In regions of fairly high rainfall but less temperature differences between winter and summer and broad-leaved evergreen subtropical biome
Injury to adrenal cortex is not likely to affect the secretion of which one of the following? 1. Aldosterone 2. Both Androstenedione and Dehydroepiandrosterone 3. Adrenali
the main excretory system in lower animals
Which one of the following statements about human sperm is correct? 1. Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilis
Define the interaction of vitamin c with lead and mercury? Vitamin C, lead and mercury: Iron alleviates lead toxicity but ascorbic acid is ineffective. Ascorbic acid alleviat
Q. What is a population? In the Biology a population is a set of individuals of the same species living in a given place and in a given time.
Ribonucleases and deoxyribonucleases These enzymes are responsible for the degradation of dietary nucleic acids. Ribonucleases and deoxyribonucleases secreted by the
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd