Why does exposure to high temperatures cause an enzyme to lose its biological properties?

The three dimensional structure of the enzyme becomes changed

The substrate blocks the active site at high temperatures

Chemical reactions cannot take place at high temperatures

High temperatures increase the activation energy of reactions.

How can the activity of a human amylase enzyme be increased during a laboratory experiment?

Decreasing the pH from 7 to 3C.

Increasing the temperature from 20°C to 37°C

What contributes to the structure of an enzyme?

Sequence of amino acids linked by peptide bonds

Sequence of bases linked by hydrogen bonds

Sequence of substrates linked by condensation reactions

Sequence of polypeptides linked by hydrolysis reactions

What provides evidence for the universal nature of the genetic code?

Nucleic acids contain the same bases in all species

mRNA codons are assigned to the same amino acids in different species

The amount of A is equal to the amount of T and the amount of G is equal to the amount ofC

Uracil replaces thymine in RNAB.

What is “naked DNA”?

DNA not super-coiled into chromosomes

DNA not surrounded by a nuclear envelope

DNA that is single-stranded due to heat treatment

DNA not associated with proteins

How is the sequence of DNA conserved?.

Complementary base pair matching during DNA replication

Unwinding of the double helix by helicase during DNA replication

Separation of sister chromatids to opposite poles during mitosis

Transcription into complementary RNA for protein synthesis

What happens during glycolysis for one molecule of glucose?

There is a net gain of two NADPH + H+

IB Biology Unit 2 Study Guide

Biology

KG - University

NGSS covered

Used 387+ times

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What property of water makes it suitable as a coolant?

Water is a good solvent so it can transport heat from the body

Water molecules are cohesive and stick to the skin.

It takes a lot of energy for water to evaporate

It takes a lot of energy to increase the temperature of water.

Tags

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is a difference between carbohydrates and lipids in energy storage?

Carbohydrates are used for long term storage and lipids for short term storage.

Carbohydrates contain more energy per 100g than lipids

Carbohydrates store food only in plants whereas lipids store food in plants and animals.

Carbohydrates are more easily transported to where energy is required than lipids.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which molecule is a polysaccharide?

Cellulose

Fructose

Maltose

Sucrose

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What are the most frequently occurring elements in living organisms?

nitrogen, carbon, oxygen and hydrogen

carbon, phosphorus, oxygen and nitrogen

calcium, sodium, nitrogen and phosphorus

calcium, phosphorus, iron and sodium

Tags

NGSS.HS-LS1-6

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which molecule is a monosaccharide?

Cellulose

Starch

Fructose

Maltose

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What type of Molecule?

Tags

NGSS.HS-LS1-6

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which molecules show a monosaccharide and a fatty acid?

Tags

NGSS.HS-LS1-6

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IB Biology Unit 2 Study Guide

What property of water makes it suitable as a coolant?

What is a difference between carbohydrates and lipids in energy storage?

Which molecule is a polysaccharide?

What are the most frequently occurring elements in living organisms?

Which molecule is a monosaccharide?

What type of Molecule?

Which molecules show a monosaccharide and a fatty acid?

Why does exposure to high temperatures cause an enzyme to lose its biological properties?

Molecules A and B are amino acids and C is a dipeptide. Which reaction represents a condensation reaction?

How can the activity of a human amylase enzyme be increased during a laboratory experiment?

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