What are the three major functions of membrane proteins?
What will be an ideal response?
Ans: some move materials through the membrane, others are involved in intercellular recognition and adhesion, while others receive chemical signals from the cell's external environment.
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Ribosomes that do not anchor to the surface of the rough endoplasmic reticulum during translation most probably
A) are synthesizing cytoplasmic proteins. B) have a defect in ribosomal proteins that allow attachment to the ER. C) have a signal/trafficking error. D) do not make the appropriate anchor protein. E) all of the above
What is an open reading frame (ORF)?
a. a protein coding sequence plus associated regulatory sequences b. the sequence between and including a start codon and an stop codon c. the sequence between and including a start codon and an stop codon, minus the introns d. the sequence between and including a start codon and an stop codon, minus the exons e. the sequence between a start codon and stop codon in prokaryotes only
Quaternary structure of a protein refers to ________
A) the sequence of amino acids in a polypeptide B) alpha-helical or beta-sheet arrangements of protein structure C) three-dimensional coil of a polypeptide around itself D) the association of multiple polypeptide subunits to form a functional protein E) the number of amino acids in a polypeptide chain
Please match the diseases with their most common portal of exit.
Gonorrhea A) Respiratory tract (aerosols) B) GI tract (saliva droplets) C) Exudates from skin lesions D) GI tract (diarrhea) E) Reproductive tract (semen) F) Blood through a contaminated needle