The ilv-leu operon of bacillus subtilis comprises seven genes necessary for the biosynthesis of isoleucine, valine, and leucine. the structural genes of this operon are transcribed when these amino acids are deficient in the cell. the vana operon codes enzymes that modify the binding targets of antibiotic vancomycin and therefore give antibiotic resistance to the bacteria. the structural genes of this operon are transcribed when the antibiotic vancomycin is present in the environment. and the vana operon is operon.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

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explanation:

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answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

sorry, is there a picture? i do not see any arrows.

wut? unius0123 wut?