100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
BIOS 260 Chapter 2 with Verified Solutions $12.99   Add to cart

Exam (elaborations)

BIOS 260 Chapter 2 with Verified Solutions

 3 views  0 purchase
  • Course
  • BIOS 260
  • Institution
  • BIOS 260

BIOS 260 Chapter 2 with Verified Solutions 1. The nucleotides in DNA are held together in a double-stranded helix, list the specific pair of bases that bond to form a DNA molecule. What is the

Preview 3 out of 18  pages

  • September 18, 2024
  • 18
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • BIOS 260
  • BIOS 260
avatar-seller
GOLDTUTORS
BIOS 260 Chapter 2 with Verified Solutions

1. The nucleotides in DNA are held together in a double-stranded helix, list the specific pair of

bases that bond to form a DNA molecule. What is the importance of this specificity?

Correct Ans-DNA is two polynucleitide chains. Thymine bonds with Adenosine, Cytosine

bonds with Guanine.


These pairings are important because they make a hydrogen bond - which is weaker than a

covalent bond.


A hydrogen bond is important because it is weak enough to be reversibly broken - but strong

enough to stabilize the double helix structure.




2. What determines the shape of a protein? How many levels of structure do proteins have?

Correct Ans-The shape of a protein is determined by its primary structure (sequence of

amino acids). Proteins have four levels of structure: primary, secondary, tertiary, quaternary




3. Name three conditions which can denature a protein. What does this mean for the function

of the protein? Correct Ans-1. Too much heat


2. Too cold


3. Changing to a non-suitable pH


Denatured means the protein loses its function.

, BIOS 260 Chapter 2 with Verified Solutions

4. Can you explain how small insects such as water striders walk on water? Correct Ans-

Cohesion causes surface tension.


Cohesion is defined as "the sticking together of particles of the same substance."




5. What are the four subunits of proteins? And the bonds that join them? Correct Ans-

Subunits for Carbohydrates: Sugars


Subunits for Lipids: Fatty Acids


Subunits for DNA: Nucleic Acids


Subunits for Proteins: Amino Acids


The bonds that join them are: Peptide Bonds




1. What is the respective approximate ratio of carbon, hydrogen and oxygen atoms found in

all carbohydrates? Give an example for a carbohydrate. Correct Ans-1:2:1 Ratio


1 Carbon for every 2 Hydrogens for every for every 1 Oxygen




Why do unsaturated fats tend to be liquid while saturated fats tend to be solid? What unique

property does each possess? Correct Ans-Unsaturated fats have one or more double bonds

inside their fatty acid chains. The 2 Carbons each have triple or double bonds and hydrogens

, BIOS 260 Chapter 2 with Verified Solutions

cannot saturate them. This makes the entire molecular structure weaker so its stays liquid at

room temp.




Saturated fats do not have double bonds in their fatty acid chains so they are solid at room

temp.




What is the pH scale? What does it mean if there are lots of H+ ions in a solution? What does

it mean if there are lots of OH- ions in a solution? What is the function of a buffer? Correct

Ans-A measure of how acidic/basic something is. If there are a lot of H+ ions in a solution, the

solution is an acid. If there are a lot of OH- ions in a solution, it is a base. The function of a

buffer is to minimize the change in pH when a base or acid is added to the solution.




4. What is adenosine triphosphate (ATP)? Describe the function of this molecule. Correct

Ans-An ATP molecule is composed of Carbon, Hydrogen, Nitrogen, Oxygen and Phosphorus

atoms. There are three phosphorus atoms in the molecule. ATP provides energy - through the

break down of food.

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 GOLDTUTORS. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $12.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

82191 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$12.99
  • (0)
  Add to cart