Lecture 17

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What is the main characteristic of noncovalent bonds?

They are strong and rigid.

They are weak and transient. (correct)

They are permanent.

They do not influence molecular structure.

Which type of interaction is primarily responsible for the flexibility of biological membranes?

Ionic interactions

Covalent bonds

Hydrophobic interactions (correct)

Hydrogen bonds

What type of bond forms between charged amino acids?

Hydrogen bond

Ionic bond (correct)

Covalent bond

Hydrophobic interaction

What is the optimal distance for van der Waals interactions?

An intermediate distance that minimizes energy Signup and view all the answers

Which of the following is a characteristic of hydrogen bonds?

They are formed between a hydrogen atom and an electronegative atom. Signup and view all the answers

Which property of water allows it to act as an excellent solvent for many biological molecules?

Polarity Signup and view all the answers

What happens to ions like Na+ and Cl- in an aqueous solution?

They interact with water molecules. Signup and view all the answers

What is the primary role of dispersion forces in biological systems?

To stabilize macromolecular structures Signup and view all the answers

Why is ice less dense than liquid water?

Both B and C. Signup and view all the answers

What best describes water's high heat capacity?

It requires a lot of energy to change temperature. Signup and view all the answers

What type of bond is formed when a hydrogen atom is covalently bonded to an electronegative atom and attracted to another electronegative atom?

Hydrogen bond Signup and view all the answers

Which of the following interactions is a result of temporary dipoles?

Dispersion forces Signup and view all the answers

How do hydrophobic molecules behave in water?

They clump together to minimize contact with water. Signup and view all the answers

What type of bond is considered very strong in solid forms like NaCl?

Ionic bond Signup and view all the answers

What is the significance of lone pairs in polar covalent bonds?

They can act as hydrogen bond acceptors. Signup and view all the answers

What is the primary function of salt bridges in proteins?

To stabilize tertiary structure Signup and view all the answers

Which of the following is NOT a property of water?

Low surface tension Signup and view all the answers

What is the role of hydrogen bonds in the structure of proteins?

They contribute to the secondary structure. Signup and view all the answers

What happens to the boiling point of water due to its hydrogen bonding?

It increases compared to other similar molecules. Signup and view all the answers

Which of the following describes a typical feature of van der Waals interactions?

They are distance-dependent and weak. Signup and view all the answers

In the context of protein stability, what is meant by the term "collectively strong" regarding noncovalent interactions?

Many weak interactions together create stability. Signup and view all the answers

What is the effect of temperature on hydrogen bonding in water?

Higher temperatures break hydrogen bonds. Signup and view all the answers

Which of the following correctly describes hydrophobic interactions?

They lead to the clustering of nonpolar molecules in water. Signup and view all the answers

What contributes to the high surface tension of water?

Strong hydrogen bonding Signup and view all the answers

What defines a polar covalent bond?

Unequal sharing of electrons due to electronegativity Signup and view all the answers

What is the role of water in enzyme catalysis?

It can act as a substrate or product. Signup and view all the answers

What is the role of metal ions in biological systems?

They stabilize protein structures through ionic interactions. Signup and view all the answers

What characteristic of water allows for the survival of aquatic life in freezing conditions?

Ice floats on water. Signup and view all the answers

What type of noncovalent interaction is involved in the clumping of hydrophobic molecules in aqueous environments?

Hydrophobic interaction Signup and view all the answers

Lecture 17 – Noncovalent bonds

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