Unit 1 Test Macromolecules

Biological catalysts are involved in many processes that occur in the human body. The illustration represents a series of reactions that occurs in the body. High temperatures can cause bonds between amino acids to permanently change. If the bonds between amino acids change, the shape of the catalyst will also change. This can cause the reaction to slow. Which of the following arguments is supported by this information?

• Adding heat to a reaction will slow the rate of the reaction.
• Altering the bonds of amino acids will cause a reaction to lose energy.
• The shape of a biological catalyst will affect its ability to help connect the original molecules.
• The heat in a reaction can misshapen the original molecules to the point where they cannot bond.

Identify the dependent variable in the following experiment: A scientist measures the growth of a plant as he changes the amount of light each plant receives.

• amount of sunlight
• amount of plants
• the scientist
• the plant growth

Identify the independent variable in the following experiment: A biologist is interested in the effects of global warming on aquatic animals. Therefore, he took samples of 10 urchins from the same site that all had different ocean temperatures. He then studied the thickness of each animal's shell.

• number of urchins
• ocean temperatures
• shell thickness
• urchin size

In a valid,controlled experiment, how many variables can be changed at a time?

• one
• two
• all variables
• three

The following statement is a hypothesis formed about marsh grass: If the amount of nitrogen marsh grass receives is increased, then the height of the grass will increase, because nitrogen is an essential nutrient needed for marsh grass to grow. What is the independent variable of the statement above?

• Height of grass
• Essential nutrient
• Amount of nitrogen
• Amount of growth

Adam is conducting a science experiment on the effect of different environments on plant growth. He put one plant in a closet and the other plant in a window at his house. He measured the growth of each plant weekly for six weeks. He then created a graph after he reviewed his data. What is the DEPENDENT variable in Adam's experiment?

• Total Growth of Plant.
• The Effect of Different Environments
• There is no independent variable
• Plant Environment
• The dark closet

Say you want to know whether caffeine affects your appetite. The presence/absence of a given amount of caffeine would be the __________ variable. How hungry you are would be the __________ variable.

• independent, dependent
• dependent, independent
• control, manipulated
• evidence, claim

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 soluble in in water. Which of the following macromolecules is the unknown substance most likely to be?

• carbohydrate
• lipid
• protein
• nucleic acid

Which graph depicts enzyme activity?

• 
• 
• 
• 

Which line represents a chemical reaction WITH an enzyme catalyst?

• blue line A
• both blue line A and red line B
• red line B
• this isn't an enzyme catalyst reaction