DNA methylation and macroH2A contribute to the stable repression of the inactive X chromosome  A. Wutz and J. Gribnau, Curr. Opin. Genet. Dev. 17 (2007): 387–393. inactive specific transcript), which is stably expressed only on the inactive X chromosome.

TLS Online TPP Program

#Id: 4677

#Unit 13. Methods in Biology

A modification of the agglutination reaction, called agglutination inhibition, provides a highly sensitive assay for small quantities of an antigen. For example, one of the early types of home pregnancy test kits included latex particles coated with human chorionic gonadotropin (HCG) and antibody to HCG. 

TLS Online TPP Program

#Id: 7197

#Unit 5. Developmental Biology

TLS Online TPP Program

#Id: 7154

#Unit 6. System Physiology – Plant

Two additional proteins and two histone deacetylase enzymes (HDA6 and HDA19) act as co-repressors along with the JAZ–COI1 complex and are instrumental in maintaining the chromatin in an inactive state.

TLS Online TPP Program

#Id: 6083

#Unit 10. Ecological Principles

Hot spots of biodiversity

There is a in situ conservation. the hot spots are the richest and the most threatened reservoirs of biodiversity on the earth.

To qualify as a biodiversity hotspot, a region must meet two strict criteria:

A) It must have at least 1,500 vascular plants as endemics - which is to say, it must have a high percentage of plant life found nowhere else on the planet

B) It must have 30% or less of its original natural vegetation. In other words, it must be threatened.

Other 

High degree of endemism (Restricted habitat) 

High degree of exploitation 

High Degree of Biodiversity 

TLS Online TPP Program

#Id: 9523

#Unit 6. System Physiology – Plant

Three major types of insect herbivores

Phloem feeders, such as aphids and whiteflies, cause little damage to the epidermis and mesophyll cells. Phloem feeders insert their narrow stylet, which is an elongated mouthpart, into the phloem sieve tubes of leaves and stems.