Most tumors have an unique property to induce the formation of new blood vessels that invade the tumor andnourish. This process is known as

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#Question id: 15480

#Unit 12. Applied Biology

Feedback repression involves the turning “off” of enzyme synthesis when the amount of the product has been made in sufficient quantities. The end product of the pathway acts as

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#Question id: 2886

#Unit 2. Cellular Organization

Match the following sites of modifications on histones given in Column I with their effect on transcription given in Column II.

COLUMN I                                               COLUMN II

1) Methylation of H3K36 in transcribed region               a) Activation

2) Ubiquitinylation of H2BK120 in mammals                b) Repression

3) Phosphorylation of H2AT120                                    c) Elongation

4) Hypoacetylated Lysine

5) Acetylation of H4K8

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#Question id: 33485

#Unit 2. Cellular Organization

Most genes are uninterrupted in yeast, but most genes are interrupted in flies and mammals. Uninterrupted genes have

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#Question id: 12970

#Unit 10. Ecological Principles

In deep-sea hydrothermal vents near the Galapagos Islands, bacteria obtain energy by oxidizing hydrogen sulphide released from the vents. Giant tube worms, which lack mouths and digestive systems, harbour the bacteria in their tissues and use them as a source of organic molecules. Clams obtain energy by filtering bacteria directly from the water, and numerous crabs and octopi feed on the clams. In this unique ecosystem, the bactena are playing the role of

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#Question id: 3434

#Unit 11. Evolution and Behavior

type of learning that can occur only during a brief period of early life and results in a behavior that is difficult to modify through later experiences is called