- A) Hydrogen is less electronegative than oxygen, generating a partial negative charge near the hydrogen atom.
- B) Hydrogen is more electronegative than oxygen, generating a partial positive charge near the hydrogen atom.
- C) Oxygen is more electronegative than hydrogen, generating a partial negative charge near the oxygen atoms.
- D) Oxygen is less electronegative than hydrogen, generating a partial positive charge near the oxygen atoms.
Elements of Life
Total MCQ: 5
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2 Water is known as a cohesive molecule due to the presence of hydrogen bonding. Water is also adhesive to other molecules. Which of the following does not use these properties of water to function?
- A) Mass transport through the xylem of plants and blood vessels in animals.
- B) Surface tension on a body of water meets the air to create a lm on the body of water.
- C) Capillary action within xylem vessels.
- D) Evaporation of water from the skin during sweating.
3 Nitrogen is a key part of building biomass because of its presence in all amino acids and therefore proteins. Which of the following best describes nitrogen within a protein?
- A) Each amino acid contains an amine group (-NH₂)
- B) Each amino acid contains a nitrate group (-NO ) 2-
- C) Each protein molecule contains an amine group (-NH₂)
- D) Each protein molecule contains a nitrate group (-NO )
4 Exploring the molecular pathways and physiological importance of carbon, nitrogen, and phosphorus in dierent biological systems has highlighted their contributions to life’s fundamental processes. Carbon forms the framework of biological molecules, nitrogen is critical for proteins and nucleic acids, and phosphorus is essential for nucleic acids, membrane structure, and energy metabolism. Cellular membranes contain phospholipids which provide structure and specic physiological characteristics to support the molecular pathways of the cell. Which of the following models represents the correct arrangement of phosphorus within a phospholipid?
- A) A
- B) B
- C) C
- D) D
5 Water molecules are composed of the atoms hydrogen and oxygen, which are held together by covalent and hydrogen bonds. Which of the following models best demonstrates the arrangement of hydrogen bonds between water molecules? (Hydrogen bonds are depicted by dashed lines.)
- A) A
- B) B
- C) C
- D) D