Research Unit 1 Exam

A student constructs several terrariums like the one shown below.

Each terrarium is exposed to a different amount of sunlight each day. In order to determine the ideal amount of sunlight, which of the following variables must be held constant? (SC.912.N.1.1)

• Type of plant

• Growth rate of plant

• amount of sunlight received

• All of the above

An experiment setup involving plants, soil, and light bulbs is shown below. The four squares represent four different set ups. Which variable is most likely being tested? (SC.912.N.1.1)

• Hours of light exposure

• Plant species

• Soil volume

• Soil pH

Data from a plant growth experiment are shown below:

The graphs show the results of two separate experiments using the same plant species. Students now want to determine how the use of rainwater or bottled water affects the growth of this plant species. Which conditions should be used for optimal plant growth? (SC.912.N.1.1)

• 20 °C, 10 mL/day

• 25 °C, 35 mL/day

• 30 °C, 45 mL/day

• 35 °C, 20 mL/day

Which type of biological macromolecule depends most upon its three-dimensional shape to function properly? (SC.912.L.18.1)

• lipid

• protein

• nucleic acid

• carbohydrate

Glucose, C6H12O6 and pictured below, can bond together to form carbohydrate polymers of starch or cellulose. What type of molecule is glucose? (SC.912.L.18.1)

• amino acid

• nucleotide

• monosaccharide

• fatty acid

A student writes a research paper on the function of lipids in the human body. Which of the following would be an appropriate title for the report? (SC.912.L.18.1)

• Energy Storage and Cell Membranes: An Extraordinary Molecule

• Strong Muscles and Bones: How the Body Build Them

• Energy for Activities Right Now.

• Genetics and You

Proteins are one of four classes of biological macromolecules. Which of the following statements regarding proteins is NOT true? (SC.912.L.18.1)

• Amino acids are the monomers of proteins.

• Proteins contain nitrogen as well as carbon, hydrogen, and oxygen.

• Proteins have only one specific role - to regulate the rate of biochemical reactions.

• Protein monomers have a carboxyl group on one end and an amino acid on the other.

A scientist analyzing an unknown substance has determined that it consists of carbon, hydrogen and oxygen. During experimentation, she determines that the substance is soluble in oil but not in water. Which of the following macromolecules is the unknown substance most likely to be? (SC.912.L.18.1)

• carbohydrate

• lipid

• nucleic acid

• protein

. Water is essential for life. Its special properties make water the single most important molecule in plant life. Which of the following properties of water enables it to move from the roots to the leaves of plants? (SC.912.L.18.12)

• Water expands as it freezes.

• Water is an excellent solvent.

• Water exhibits cohesive behavior.

• Water is able to moderate temperatures.

The Gulf Stream is an ocean current that flows along Florida’s east coast. It has an important moderating effect on the climates of northern latitudes, particularly in Greenland, Canada, and Europe. What property of water makes the climate of these areas milder than they would otherwise be? (SC.912.L.18.12)

• melting point

• high specific heat capacity

• polarity and electronegativity

• expansion of crystal structure as water freezes