ch 15 lipids

Ch 15 lips

1. Which fatty acids have higher melting points?

→ Saturated fatty acids

2. Which unsaturated fatty acids have higher melting points?

→ Trans unsaturated fatty acids

3. Which lipids contain glycerol?

→ Triacylglycerols

→ Glycerophospholipids

4. Which lipids contain phosphate?

→ Glycerophospholipids

→ Sphingomyelins

5. Which describes cholesterol?

→ Steroids

6. Which describes hormones?

→ Steroids

7. Cholesterol is mainly in the esterified form with fatty acids in blood.

→ True

8. Lipoproteins transport only cholesterol through the bloodstream.

→ False

9. Which lipids mostly comprise lipoproteins?

→ Triacylglycerols

→ Phospholipids

→ Steroids

10. Lipoproteins create a hydrophilic interior space for solubilizing lipid payloads.

→ False

11. Which part of phospholipids are polar?

→ Phosphate heads

12. Which part of phospholipids face outward in lipoproteins?

→ Phosphate heads

13. High-density cholesterol (HDL) is considered good.

→ True

14. Low-density cholesterol (LDL) lipoproteins are larger and contain fewer proteins than HDL.

→ True

15. Lipoproteins are comprised of lipid bilayers.

→ False

16. Lipoprotein lipid monolayers contain free cholesterol.

→ True

17. Cell membranes are comprised of lipid monolayers.

→ False

18. Cell membranes function as a barrier between the cytosol and extracellular fluid.

→ True

19. Cell membranes are composed primarily of triacylglycerols.

→ False

20. Cell membranes contain free cholesterol to make them more fluid.

→ True

21. Cell membranes contain DNA and RNA.

→ False

22. Cell membranes contain carbohydrates on their surface.

→ True

23. Cell membranes contain proteins.

→ True

24. Some cell membrane proteins are used to transport molecules across the membrane.

→ True

25. Active transport across a membrane moves molecules from high to low concentration.

→ False

26. Passive transport across a membrane moves molecules from high to low concentration.

→ True

27. Diffusion across a cell membrane only occurs for large molecules.

→ False

28. Facilitated transport across a membrane utilizes protein channels.

→ True

29. Facilitated transport across a membrane can be passive or active.

→ True

30. Diffusion across a membrane can only be active.

→ False

31. Cell membranes are considered “fluid mosaics” because:

→ They are flexible/not rigid

→ They contain many different types of molecules