Hormones are bigger than the cell pores hence cannot pass through the cell membrane to influence biochemical processes. Therefore, hormones (such as glucagon and insulin) bind onto receptors on the cell membrane, then transmembrane proteins, such as the G-protein, change conformation activating the secondary messengers inside of the cell. Cyclic- AMP is a major secondary messenger significant in activating protein kinases.

3 0

3 years ago

In Escherichia coli, the genes lac , gal , trp , and his are necessary for utilization of lactose, utilization of galactose, syn

PolarNik [594]

Answer:

Minimal media + glucose + streptomycin

Explanation:

Those capable of synthesizing galactose can grow in minimal media, the availability of streptomycin will destroy those who are susceptible to the antibiotic, whereas glucose, a carbon source from which galactose may be produced and will encourage growth.

Therefore:

The medium should not include galactose when selecting for gal⁺.

Streptomycin should be present in the medium to select against $str^s$ .

The medium to choose is: Minimal media + glucose + streptomycin.

8 0

3 years ago

Ribosomal RNA is produced by _____.

storchak [24]

The answer should be <span>B. nucleoli</span>

4 0

3 years ago

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