BCH exam 2 Questions and Correct Answers the Latest Update and Recommended Version
2 views 0 purchase
Course
BCH
Institution
BCH
Properties of waxes
→ low melting points, stable solids, appear in both plants and animals in nature
→ a wax coat protects the surface of many plant leaves from water loss and attack from
microorganisms
What defines a carbohydrate?
→ aldehydes & ketones with many OH groups, or substanc...
BCH exam 2 Questions and Correct
Answers the Latest Update and
Recommended Version
Properties of waxes
→ low melting points, stable solids, appear in both plants and animals in nature
→ a wax coat protects the surface of many plant leaves from water loss and attack from
microorganisms
What defines a carbohydrate?
→ aldehydes & ketones with many OH groups, or substances that form these when
hydrolyzed
Where do carbohydrates come from?
→ primary products of photosynthesis- extracts carbon from atmosphere and creates
carbs out of that carbon
How are monosaccharides names
→ 1. Based off Aldose or Ketose
→
→ 2. Based off # of Carbons
What is the simplest aldiose and the simplest ketone
Define the D & L stereochemistry of carbohydrates & how it is determined
→ based off glyceraldehyde, CH2OH down in fisher projection
→ - look at side of -OH group
→
→ -OH on right: D- configuration
→ -OH on left L- configuration
→
→ *** OH of highest number Carbon
→ nonsuperimposable mirror images
→ D & L configurations
How many stereoisomers can a molecule have?
→ 2^n where n = # chiral centers
What is a diastereomer?
→ don't differ at ALL chiral carbons, therefore not mirror images
→
→ different physical and chemical properties
What is an epimer? Provide an example
→ 2 sugars that differ only in the configuration around 1 carbon
→
→ galactose and mannose are epimers of glucose
→
→ alpha-D glucose has 3 epimers: B-D-glucose, a-D-mannose, and a-D-galactose
→ D-aldopentoses:
→ 1. D-ribose
→ 2. D-xylose
→
→ What are the 2 D-aldothreoses:
→ 1. D-erythrose
→ 2. D-threose
What defines a disaccharide (upon a hydrolysis run)?
→ forms 2 monosaccharides when hydrolyzed
What defines a polysaccharide?
→ forms many monosaccharides when hydrolyzed
What is a hemiacetal and a hemiketal?
→
What kind of sugars can form rings? What are they called?
→ 5- 6-, and 7- carbon sugars
→
→ Pyranose: 5 members
→ Furanose: 6 members
How are cyclic monosaccharides formed? What arises upon formation?
→ the -OH group on a hexose will attack C-1 to form a ring
→ * the C-1 is the "ball" in the ball and stick models
→
→ when the ring is formed, a new asymmetric carbon is introduced into the molecule
1|Page| GradeA+ | 2 0 0 2 5
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 TestTrackers. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.49. You're not tied to anything after your purchase.
