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.
Describe the factors that are involved in the regulation of respiration in a child who decides to hold his/her breath for as long as possible.
1000 words
Significance of Lingual nerve and artery Because the nerve lies medial to the retromolar pad, incisions in this region should remain lateral to the pad and mucosal reflection s
Normal 0 false false false EN-IN X-NONE X-NONE
Q What are the chloroplasts? What are the major functions of chloroplasts? Chloroplasts are organelles present in the cytoplasm of algae and plant cells, like mitochondria, chl
What is the part of the female reproductive system where fecundation occurs? Fecundation generally happens in the Fallopian tubes but it can also take place within the uterus.
When glucagon binds its receptor there is an increase in the second messenger, cAMP. cAMP levels can be decrease by which of the following enzymes? -adenylate cyclase -PDK1
State in brief about the Neuropsychological tests Neuropsychological tests have to be constructed using the psychometric approach the interpretation of test performance would n
explain the relationship between concentration gradient and active and passive transport
Give an example of how two organisms are interdependent.
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