A cell does not want to waste energy synthesizing the amino acid arginine if arginine is present in its diet. Therefore, when arginine is present, it activates a repressor protein to prevent transcription of genes that code for enzyme to make arginine. This is an example of what type of regulation?

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#Question id: 19982

#XL - P Chemistry

According to VSEPR theory geometry of which block elements can be explain ?

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#Question id: 5603

#XL - T Zoology

During capacitation, the pathway is modulated by the removal of cholesterol from the sperm cell membrane, which allows 

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#Question id: 4589

#XL - S Microbiology

Darwin used the phrase "descent with modification" to explain ________.

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#Question id: 769

#XL - Q Biochemistry

MicroRNAs are developed from:

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#Question id: 2374

#XL - Q Biochemistry

Which of the following best describes the fluid mosaic model?