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Answer on Cell Biology Question for tracy guido

Question #58960
Intracellular receptors are located in either the cytoplasm or the nucleus. Which type of ligands binds to intracellular receptors? small hydrophobic molecules, large water soluble molecules, small water soluble molecules, or large polar molecules.

Select the description of an exon - noncoding portion of a DNA sequence that is removed from pre mRNA, altered guanine nucleotide added to the front of pre-mRNA, portion of a DNA sequence that is not removed from pre-mRNA and is expressed in the protein, or sequence of adenine nucleotides added onto the end of pre-mRNA.
Expert's answer
Question 1. Correct answer small hydrophobic molecules. To interact with receptors located in cytoplasm, the ligand must cross the hydrophobic membrane. Only small hydrophobic molecules can pass it.

Question 2. Correct answer portion of a DNA sequence that is not removed from pre-mRNA and is expressed in the protein. Exon is the coding region of DNA, which is preserved after mRNA maturation and used by ribosome to produce protein. The rest of the variants describe the non-coding sequences on mRNA.

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