Chemistry in Living Systems

The model shows water molecules interacting. The gray circles represent oxygen, the white circles represent hydrogen. Which conclusion is supported by this model?

• Hydrogen atoms in water molecules are only attracted to other hydrogen atoms.

• Oxygen atoms in water molecules are attracted to both oxygen atoms and hydrogen atoms.

• Oxygen atoms in water molecules are also attracted to hydrogen atoms in other water molecules.

Tags

NGSS.MS-PS1-1

Which statement best explains the role of energy in cellular respiration?

• The cell destroys energy by breaking down large molecules.

• The cell creates stored chemical energy by capturing solar energy.

• The cell moves stored chemical energy to different chemical bonds.

Tags

NGSS.HS-LS1-7

Scientists can radioactively label elements to track them in a chemical reaction. The reaction shows the formation of glucose during photosynthesis. The asterisk shows radioactive oxygen. Based on the chemical equation, adding radioactive oxygen in which part of the environment would produce radioactive glucose?

• air

• water

• energy

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-6

The diagram shows a model of the conversion between ATP and ADP. Which statement does the model support?

• ATP contains more energy than ADP.

• ADP contains more energy than ATP.

• ATP and ADP contain the same amount of energy.

Tags

NGSS.HS-LS1-7

Which pair of molecules are both compounds?

• H2, CO2

• H2O, N2

• CO2, H2O

Which property of water is most responsible for water moving from the roots to the leaves of a plant?

• osmosis

• adhesion

• high specific heat

The diagrams show carbon-based molecules. Based on evidence from the images, which statement about the bonding of carbon atoms is true?

• Carbon has the ability to form up to four bonds.

• Carbon atoms form ring structures each time they bond.

• Carbon containing compounds must contain double bonds.

Tags

NGSS.HS-LS1-6

NGSS.HS-PS1-2

Write one letter in each blank to correctly complete the sentences. Catalysts 1. _____ the activation energy of a reaction and 2. _____ the difference of energy in a reaction. Because of these properties, catalysts are used by cells to 3. _____ the rate of reactions that help the cells maintain homeostasis. 1. and 2.

• increase

• decrease

• do not affect

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

The diagram shows three types of transport the cell uses to move molecules across the cell membrane. What type of transport is represented by the middle box?

• diffusion

• passive transport

• active transport

This model shows fructose, a common sugar. Which element below would not be found in fructose?

• carbon

• hydrogen

• nitrogen

Tags

NGSS.HS-LS1-6