26) If an enzyme is composed of 3 subunits, dissociating or separating the indiv
ID: 3506818 • Letter: 2
Question
26) If an enzyme is composed of 3 subunits, dissociating or separating the individual subunits would 3 su : disrupt the tertiary structure of the protein 2 require breaking peptide bonds 3 disrupt the quaternary structure of the protein 4. have no effect on the structure of that proteirn 2n Which of the following uses DNIA as a template during protein synthesis? or Repi licati 3. Translation 4. Polymerization 28) Which of the following fluids could be found outside the cell? 1. the cytosol and the cytoplasm 2. plasma and the cytosol 3. the interstitial fluicd 4 the stroma 29) Which cell? com ponent of the cell membrane is primarily responsible for lubricating the surface of the 1. glycocalyx 2. peripheral proteins 3. cholesterol 4. phospholipids 30) Micelles, liposomes and phospholipid bilayers form by reaction of phospholipids with water 2. I. spontaneously after mixing phospholipids and water 3. after adding energy to a system containing phospholipids and water 4. in order to prevent phospholipids interacting with water 31) Which of the following is not an important function of the cell membrane? to regulate exchange the environment 2. to store energy in the form of phospholipids 3. to provide physical isolation 4. to allow sensing the extracellular environment 32) Which type of membrane 1. receptor proteins 2 carrier proteins 3 channel proteins 4. integral proteins 33) How would you name a large protein bound to a small glycan group? 1integral protein 2. proteoglycan 3. glycoprotein 4 glucoprotein 34) Microvilli contain 1. a core made of actin and play a role in cell movement 2. a core of microtubules and play a role in cell division and organelle movement 3. a core of tubulin and play a role in moving the fluid that surrounds cells in organs such as the trachea 4. a core of microfilaments and increase surface area in order to facilitate absorptionExplanation / Answer
26) Option 3 is the correct answer.
An multisubunit enzyme usually exist in a quaternary protein struction. Dissociation of the enzymatic subunits will lead to disruption in the quaternary structure of protein and loss of activity of enzyme. Tertiary is the 3-dimensional, functional form of a protein, however it usually consists of one polypeptide subunit only, hence a multisubunit enzyme has a quaternary structure.
27) Option 2 is the correct answer.
The process of synthesis of protein from DNA involves 2 steps. The first step is Transcription which uses DNA as a template to form Messenger RNA copies which then undergo through Translation which is the second step of the protein synthesis mechanism to provide polypeptide chains. DNA cannot be directly converted to protein since it cannot be transported outside nucleus in cytoplasm where protein synthesis takes place, and it contains many unwanted regions that cannot be translated to give protein known as junk DNA. Also, RNA is more versatile and can be synthesized whenever necessary while DNA is present in only one copy in a cell and is synthesized only at time of cell division.
28) Option 3 is the correct answer.
Interstitial fluid is the main component of extracellular fluid, including plasma and transcellular fluid. The interstitial fluid is found in the interstices - the spaces between cells (also known as the tissue spaces).
29) Option 1 is the correct answer.
Glycocalyx is the pericellular matrix composed of glycolipids ansd glycoproteins that surround the surface of cells such as in bacteria, epithelial cells etc. This glycocalyx contribute to cell–cell recognition, communication, and intercellular adhesion as well as lubricating the cell surface in the form of slime layer in bacteria.
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