Importance of Carbon, Hydrogen, Oxygen, and Nitrogen in Life

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Questions and Answers

What are the primary roles of carbon, hydrogen, oxygen, and nitrogen in life?

  • Carbon for water formation, hydrogen for energy generation, oxygen for protein building, and nitrogen for molecule stabilization
  • Carbon for protein building, hydrogen for molecule stabilization, oxygen for energy generation, and nitrogen for water formation
  • Carbon for molecule stabilization, hydrogen for water formation, oxygen for cell energy, and nitrogen for protein building (correct)
  • Carbon is needed for cell energy, hydrogen for protein building, oxygen for water formation, and nitrogen for molecule stabilization

How do essential elements differ from trace elements?

  • Essential elements are not important for cell function, while trace elements are crucial for cell stability
  • Essential elements are required in small amounts, while trace elements are needed in larger quantities
  • Essential elements are needed for growth, while trace elements are unnecessary for growth (correct)
  • Essential elements are found in all living beings, while trace elements are only found in certain organisms

What is the primary role of trace elements in biological systems?

  • Extract molecules to destabilize cell structures and cause diseases
  • Generate energy for cells and promote cell growth
  • Stabilize cell structures and lead to disease prevention (correct)
  • Have no significant role in biological systems

Which particles make up all atoms?

<p>Protons, neutrons, electrons (B)</p> Signup and view all the answers

What is the charge of protons?

<p>Positive (A)</p> Signup and view all the answers

What is the primary function of oxygen in biological systems?

<p>Generate energy for cells (C)</p> Signup and view all the answers

What does an atom's atomic number represent?

<p>The number of protons in the element (B)</p> Signup and view all the answers

How do isotopes of an element differ from an atom of that same element?

<p>They have different numbers of protons (D)</p> Signup and view all the answers

What is the valence shell of an atom?

<p>The farthest layer from the nucleus (A)</p> Signup and view all the answers

Why are some isotopes important in medicine?

<p>To perform MRIs and PET scans (B)</p> Signup and view all the answers

What does the electronegativity of an element refer to?

<p>The ability to attract electrons (C)</p> Signup and view all the answers

Why are the noble gases considered to be inert?

<p>They are stable and do not react with other elements (A)</p> Signup and view all the answers

How do you determine how many total orbitals are found within an atom when looking at a periodic table of elements?

<p>The first shell can hold a maximum of 2 orbitals (C)</p> Signup and view all the answers

What happens to the electronegativity of elements as you move from left to right across the periodic table?

<p>It increases (B)</p> Signup and view all the answers

What are the two most common types of chemical bonds seen within a molecule?

<p>Ionic and covalent bonds (D)</p> Signup and view all the answers

How does a covalent bond differ from an ionic bond?

<p>A covalent bond involves sharing electrons, whereas an ionic bond involves transferring electrons. (D)</p> Signup and view all the answers

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