Question 1

Which experiment provided the first experimental evidence that simple biomolecules could be synthesized abiotically under early Earth conditions?

Accepted Answer

The Miller-Urey experiment

Question 2

Which of the following statements best describes the 'RNA World' hypothesis?

Accepted Answer

RNA or a related precursor acted as both the first catalyst and the first genetic material.

Question 3

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 4

Which of the following elements is NOT considered one of the six most common elements essential for life?

Accepted Answer

Iron (Fe)

Question 5

What type of bond links consecutive nucleotides in DNA and RNA polymers?

Accepted Answer

Phosphodiester bond

Question 6

Which of the following best explains why unsaturated fatty acids increase membrane fluidity?

Accepted Answer

They contain double bonds that introduce kinks, preventing tight packing of lipid tails.

Question 7

Which of the following is a correct representation of the peptide bond formation between two amino acids?

Accepted Answer

$$\mathrm{R^1$-CH(NH_2$)-COOH + R^2$-CH(NH_2$)-COOH \rightarrow R^1$-CH(NH_2$)-CO-NH-CH(R^2)-$$COOH + H_2O}$

Question 8

Which of the following statements about the structure of DNA is correct?

Accepted Answer

DNA is a polymer of nucleotides joined by 5'-3' phosphodiester bonds.

Question 9

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, prokaryotic cells do not.

Question 10

Which of the following is a function of carbohydrates in living organisms?

Accepted Answer

Providing structural support (e.g., cellulose in plants)

Question 11

Which of the following best explains the evolutionary significance of endosymbiosis?

Accepted Answer

It resulted in the formation of mitochondria and chloroplasts in eukaryotic cells.

Question 12

Which of the following is a correct statement about the geometry of carbon bonding?

Accepted Answer

A tetrahedral arrangement is characteristic of carbon with four single bonds.

Question 13

Which of the following is a correct description of a phospholipid's structure?

Accepted Answer

It has a hydrophilic head and two hydrophobic tails.

Question 14

Which of the following best describes the role of cholesterol in animal cell membranes?

Accepted Answer

It provides structural support and modulates membrane fluidity.

Question 15

Which of the following is a correct example of a polysaccharide and its biological function?

Accepted Answer

Glycogen; energy storage in animals

Question 16

Which of the following best explains why water is essential for biochemical reactions in cells?

Accepted Answer

Water forms hydrogen bonds, facilitating the proper folding and function of biomolecules.

Question 17

Which of the following is a correct statement about the flow of genetic information in cells?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 18

Which of the following best describes the function of metal ions such as Mg$$^{2+}$$ and Zn$$^{2+} in $$cells?

Accepted Answer

They act as cofactors for enzymes, stabilizing structures or participating in catalysis.

Question 19

Which of the following is a correct description of the difference between starch and cellulose?

Accepted Answer

Starch is composed of $$\alpha-$$glucose monomers with $$\alpha-1$$,4 linkages, while cellulose is composed of $$\beta-$$glucose monomers with $$\beta-1$$,4 linkages.

Biochemistry Foundations: Genes, Proteins, and Biomolecules

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