Question

7 multiple choice 1 point in the following series of statements, select the false/incorrect statement. the major type of lipid found in the cell membrane is phospholipids the purpose of receptor membrane proteins is to maintain cell shape and structure cholesterol can either increase or decrease membrane fluidity based on temperature cell membranes are dynamic and the reason for this is the many van der waals forces between the fatty acid tails keeping the internal environment within a persistent and narrow window of conditions is known as homeostasis 8 multiple choice 1 point binding sites for trna are located in: the large ribosomal subunit neither ribosomal subunit both ribosomal subunits the small ribosomal subunit 9 multiple choice 1 point which one of the statements about translation in eukaryotes is correct? all of these choices are correct there is an untranslated region only at the 3 end of mature mrna an initiation complex recognizes a 5 cap structure and scans for the first aug triplet a single mrna can possess multiple protein coding regions

Explanation:

• Question 7: Receptor membrane proteins are mainly for signal - transduction and binding of ligands, not for maintaining cell shape and structure. The other statements are correct facts about cell membranes and homeostasis.
• Question 8: tRNA binding sites (A, P, and E sites) are located in the large ribosomal subunit.
• Question 9: In eukaryotic translation, an initiation complex recognizes the 5' cap structure and scans for the first AUG triplet, a single mRNA can have multiple protein - coding regions (polycistronic in some cases), and there are untranslated regions at both 5' and 3' ends of mature mRNA. So all the given statements are correct.

Answer:

• Question 7: The purpose of receptor membrane proteins is to maintain cell shape and structure
• Question 8: the large ribosomal subunit
• Question 9: All of these choices are correct