RNA interference is a mechanism of gene regulation in eukaryotes. Arrange the steps by which RNAi carries out gene regulation in the correct order.

1. The siRNA binds to a special protein,

which degrades one strand.

2. One strand of siRNA associates with the

protein to form an RNase complex.

3. The enzyme dicer cleaves dsRNA to form

small interfering RNA (siRNA).

4. The RNase complex binds to a specific

mRNA and degrades it.

1.  The enzyme dicer cleaves dsRNA to form

small interfering RNA (siRNA).

2.  The siRNA binds to a special protein,  

which degrades one strand.

3. One strand of siRNA associates with the

protein to form an RNase complex.

4. The RNase complex binds to a specific

mRNA and degrades it.  

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.

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