2. Cell Chemistry & Cell Components

Cells are surrounded by water, with which they are mostly filled. Which of the following occurs as a result?

Water is a polar molecule. What does this statement mean?

The partial charges on a water molecule occur because of __________.

In a group of water molecules, hydrogen bonds form between which of the following?

Which of the following is not a function of water? a. dispersing nutrients throughout the body; b. helping prevent cancer; c. helping to regulate body temperature; d. helping to regulate blood pressure

Water                   . a. is a good solute; b. facilitates chemical reactions; c. serves as an enzyme; d. makes strong covalent bonds with other molecules; e. consists of two oxygen and one hydrogen atoms

This chapter explains how the emergent properties of water contribute to the suitability of the environment for life. Until fairly recently, scientists assumed that other physical requirements for life included a moderate range of temperature, pH, and atmospheric pressure. That view has changed with the discovery of organisms known as extremophiles, which have been found flourishing in hot, acidic sulfur springs and around hydrothermal vents deep in the ocean. What does the existence of life in such environments say about the possibility of life on other planets?