Exam (elaborations)
Biochem 2: Exam 1 Mastery Questions
- Course
- Institution
Biochem 2: Exam 1 Mastery Questions
[Show more]
Content preview
Biochem 2: Exam 1 Mastery Questions Saturated fatty acids are different to unsaturated fatty acid s because they: A. have an even number of carbon atoms B. have short hydrophobic tails C. have no C=C double bonds D. exhibit free rotation about the carbon carbon bonds in the hydrocarbon tail E. mostly have cis double bonds - C. have no C=C double bonds Which of the following statements is FALSE? A. The longer the chain length of a saturated fatty acid, the higher the melting temperature B. The difference in melting temperature between a sat urated fatty acid and an unsaturated fatty acid with the same chain length is only a few degrees Celsius. C. Most types of fat in many animals is used in energy production D. Some unsaturated fatty acids are liquid at physiological temperatures E. Fatty acids exist in the anionic form (RCOO -) at physiological pH - B. The difference in melting temperature between a saturated fatty acid and an unsaturated fatty acid with the same chain length is only a few degrees Celsius. Explanation: Unsaturated fatty a cids tend to be more liquid because they cannot be packed as tightly as saturated fatty acids. Which of the following lipids can be a major component of biological membranes? A. Phosphatic acid B. Phosphatidylcholine C. Phosphatidylinositol D. Cholesterol E. B and D. - E. B and D Spingomyelin contains a fatty acid linked by an _________ bond and phosphocholine linked via the C -3 hydroxyl group of sphingosine. - Amide Which of the following is unlikely to be a characteristic of a membrane pr otein? A. Largely hydrophobic transmembrane segments Biochem 2: Exam 1 Mastery Questions B. α-helical membrane -spanning motifs C. Covalently attached lipid motifs D. Symmetric orientation across the membrane E. β-sheet membrane -spanning motifs - D. Symmetric orientation across the membr ane In an aqueous environment, the hydrocarbon tails of lipids tend to associate by entropy -driven ________ and by Van der Waals interactions. - Hydrophobic effects Raft platforms in membranes have functional roles in cell signaling and sorting of protei ns into specific ________ in the cell. - Organelles Which of the following statements about biological membranes is FALSE? A. They are composed of a mixture of lipids and proteins in which lateral diffusion of components is possible B. Lipids and protei ns move laterally at approximately the same rate within the membrane C. The faces of biological membranes are distinct and usually different in both composition and structure. D. Phospholipids require a specialized enzyme to facilitate movement across (flipping) the membrane E. They are often organized into smaller regions of specific function - B. Lipids and proteins move laterally at approximately the same rate within the me mbrane Explanation: Lipids move laterally within the membrane faster than proteins True or False: Integral membrane proteins can be inserted into the membrane and folded into the normal 3D structure during translation - True. Explanation: Folding and insertion happens simultaneously True or False: Lipid rafts are small long -lived structures that respond to stimuli to transiently associate with each other to form larger raft platforms. - False.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Finisher. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now