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Unit 2 – Matter & Energy Flow in the Biosphere
1.
Pre/Post Test A
Many plants have waxy coatings on some surfaces. This coating reduces water loss because it is not
water-permeable. This waxy coating is which of the following types of organic molecule?
a. carbohydrate
c. lipid
b. nucleic acid
d. protein
2. Which of the following is a product of cellular respiration?
a. oxygen
c. glucose
b. carbon dioxide
d. sunlight
3. If scientists search other planets for possible life, they are likely to focus on the presence of
molecules containing which of the following elements?
a. carbon
c. oxygen
b. iron
d. sodium
4. Many land plants store energy in starch. When energy is needed, the starch molecules can be
broken down quickly. This chemical reaction produces which of the following?
a. amino acids
c. simple sugars/glucose
b. lipids
d. RNA chains
5. Which of the following occurs during a biochemical reaction, like photosynthesis or cellular
respiration?
a. Reactant atoms are destroyed and product atoms are formed
b. Bonds of reactants are broken and atoms are rearranged into products
c. Energy from the cell is converted into atoms of the products
d. Atoms of the reactants are combined to form larger and more massive atoms of the products
6.
Why are enzymes important to the functioning of the human body?
a. They keep the pH of the body within acceptable levels
b. They help essential biochemical reactions to occur fast enough to maintain homeostasis
c. They enable the body to use energy to produce food
d. They provide cells with energy they need to carry out life functions
7. What energy transfer occurs during cellular respiration?
a. Chemical energy is converted to light energy
b. Chemical energy is converted to chemical energy and thermal energy
c. Thermal energy is converted to chemical energy
d. Light energy is converted to chemical energy
8.
Which molecules carry genetic information from one generation to the next?
a. carbohydrates
c. lipids
b. minerals
d. nucleic acids
9. How is the breakdown of glucose during cellular respiration like the burning of fossil fuels?
a. Both processes need carbon dioxide to get the reactions started
b. Both processes break-down carbon containing compounds in the presence of oxygen
c. Both processes produce ATP
d. Both processes release oxygen into the atmosphere
10. What occurs during photosynthesis?
a. Chemical energy is converted into light energy
b. Light energy is converted into chemical energy
c. Glucose is broken down to release energy
d. Carbon dioxide and energy are released into the atmosphere
11. Which of the following is a reason that animals rely on photosynthesis?
a. Photosynthesis produces an energy storing molecule called ATP that animal cells need to
function
b. Photosynthesis releases CO2 into the atmosphere that animal cells need for the process of
cellular respiration
c. Photosynthesis produces an energy storing molecule that animal cells will break down to
produce ATP
d. Photosynthesis absorbs energy from the sun that gets passed to animals which helps them
maintain their body temperatures.
12. Which organelle is the site of cellular respiration?
a. endoplasmic reticulum
b. ribosome
c. nucleus
d. mitochondrion
13. Which of the following types of molecules provides building blocks for tissues, transports other
molecules, and helps to regulate certain reactions in the human body?
a. lipids
c. carbohydrates
b. fats (lipids)
d. proteins
14. Which of the following is the correct equation for photosynthesis?
a. CO2 + H2O + light
C6H12O6 + O2
b. 6CO2 + 6H2O + light
C6H12O6 + 6O2
c. C6H12O6 + 6O2
6CO2 + 6H2O + energy
d. C6H12O6 + O2
CO2 + H2O + energy
15. Which of the following statements about nucleic acids is true?
a. Nucleotides are made of a 5-Carbon sugar, a nitrogen base, and a lipid
b. DNA and RNA are examples of nucleic acids that are rarely seen in living things
c. Nucleic acids are made of repeating units called lipids
d. Nucleic acids store important information about the manufacturing of proteins
16. Which of the following is the correct equation for cellular respiration?
a. CO2 + H2O + light
C6H12O6 + O2
b. 6CO2 + 6H2O + light
C6H12O6 + 6O2
c. C6H12O6 + 6O2
6CO2 + 6H2O + energy
d. C6H12O6 + O2
CO2 + H2O + energy
17. Which process do the animals in any food web use to convert energy from food into ATP?
a. cellular respiration
c. photosynthesis
b. osmosis
d. transcription
18. Which of the following statements about the carbon cycle is true?
a. Decomposers release carbon dioxide when they break down organic compounds
b. The burning of fossil fuels is decreasing the amount of carbon in the atmosphere
c. Plants release carbon dioxide into the atmosphere during photosynthesis
d. Respiration is the only way that carbon dioxide is released into the atmosphere
19. A tree falls down in a forest. Which organisms need to be present in order for the nutrients from
the tree to be returned to the ground?
a. bacteria
c. consumers
b. decomposers
d. parasites
20. Plants rely on ___ in the soil to convert nitrogen in the atmosphere into nitrogen-containing
compounds that a plant can take up through its roots; these compounds are used to build proteins
and DNA.
a. decomposers
c. parasites
b. fungi
d. bacteria