Practice Questions Essential Elements in Biology

Which element is the primary building block of organic molecules?

• Oxygen

• Carbon

• Hydrogen

• Nitrogen

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NGSS.HS-LS1-6

ATP, the energy molecule of cells, contains which essential element?

• Sulfur

• Carbon

• Phosphorus

• Hydrogen

Which two elements are considered electronegative and help form polar molecules?

• Carbon and Hydrogen

• Nitrogen and Oxygen

• Phosphorus and Sulfur

• Hydrogen and Sulfur

Which element forms the backbone of DNA and RNA through phosphate groups?

• Carbon

• Sulfur

• Phosphorus

• Oxygen

Hydrogen bonds are found in all of the following EXCEPT:

• Enzymes

• Proteins

• Lipids

• DNA

Why are living organisms considered carbon-based?

• Carbon is the lightest element.

• Carbon forms strong covalent bonds and complex molecules.

• Carbon reacts easily with most other elements.

• Carbon is the most electronegative element.

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NGSS.HS-LS2-5

Which of the following best describes the role of sulfur in proteins?

• It provides energy to the protein.

• It helps proteins dissolve in water.

• It forms disulfide bonds that maintain protein structure.

• It allows proteins to store genetic information.

How does nitrogen contribute to the function of DNA?

• It forms hydrogen bonds between amino acids.

• It is part of the nitrogenous bases in DNA structure.

• It provides the backbone structure of DNA.

• It transports energy in the form of ATP.

Which element plays a major role in cellular respiration?

• Phosphorus

• Sulfur

• Oxygen

• Nitrogen

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NGSS.HS-LS1-7

How do hydrogen bonds contribute to protein function?

• They store energy for later use.

• They help determine the protein’s shape and stability.

• They break down amino acids.

• They create a rigid structure similar to bones.

Tags

NGSS.HS-LS1-6