There are two broad categories of receptors that activate tyrosine kinases: (1) those in which the tyrosine kinase enzyme is an intrinsic part of the receptor’s polypeptide chain, called the_________ and (2) those, in which the receptor and kinase are separate polypeptides, encoded by different genes, yet are bound tightly together, called the __________.

TLS Online TPP Program

#Question id: 23702

#Unit 13. Methods in Biology

The major advantage of using artificial chromosomes such as YACs and BACs for cloning genes is that

TLS Online TPP Program

#Question id: 12397

#Unit 6. System Physiology – Plant

when auxin binds to its receptor is the activation of a select group of transcription factors. The activated transcription factors enter the nucleus and promote the expression of specific genes. Genes whose expression is stimulated by the activation of pre-existing  transcription factors are called primary response genes or early genes. 

a) Some of the early genes encode proteins that regulate the transcription of secondary response genes, or late genes, that are required for the short-term responses to the hormone

b) Early genes are involved in intercellular communication, or cell-to-cell signaling and some also involved in adaptation to stress

c) Secondary response genes are required for the long-term responses to the hormone. Because late genes require de novo protein synthesis, their expression can be blocked by protein synthesis inhibitors

d) Early-gene expression can also be blocked by inhibitors of protein synthesis such as cycloheximide, the time required for the expression of the early genes can be quite short, ranging from a few minutes to several hours

Which of the following is the correct prediction about primary response gene?

TLS Online TPP Program

#Question id: 1825

#Unit 4. Cell Communication and Cell Signaling

Opsonization of bacteria occurs through coating bacteria just with:

TLS Online TPP Program

#Question id: 1865

#Unit 4. Cell Communication and Cell Signaling

What deficiency is indicated by poor skin test results to a range of microbial antigens such as tuberculin and mumps?

TLS Online TPP Program

#Question id: 7166

#Unit 5. Developmental Biology

Just prior to the onset of gastrulation in an embryo, the "organizer" cells are specified. If you were to experimentally block the specification of these cells, what would you expect the result to be in the developing embryo?