Which type of protein penetrates to the interior of the plasma membrane but does not extend all the way through it?

integral

peripheral

transmembrane

interior

Integral membrane proteins.

Integral membrane proteins are named so because they are the integral components of the membrane. They cross the plasma membrane ( hydrophobic phospholipid bilayer) one or more times and impart specific function to it.  The part of the protein embedded in the bilayer is called as alpha-helical region and is mainly composed of hydrophobic amino acids.

Example-

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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atp is used for energy.