State two features that are shown by all molecules

characteristics of molecules are:

1. Molecules have definite size and mass.

2. Molecules have space between them.  

3. Molecules are in constant random motion.

4. A molecule has only one configuration

5. The mass is equal to sum of masses of all individual atoms in molecular structure

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All the molecules have definate size and definate mass, According to their function. :D

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.