Qtr 1 Exam Practice

In the winter, a pond freezes over. As the water freezes, it floats to the top of the pond and then freezes together, forming a thick layer of ice. Which characteristic of water allows ice to float after it freezes?

• Water has less mass after it freezes.

• Water has more mass after it freezes.

• Water becomes less dense after it freezes.

• Water becomes more dense after it freezes.

Which property of water enables a transpirational pull to cause water to pull through the roots and stems of a plant?

• Cohesion, which is caused by polarity within water molecules

• Neutral pH, which is caused by water’s ability to moderate temperature

• Expansion upon freezing, which is caused by nonpolar bonds within water

• High heat capacity, which is caused by water’s ability to dissolve many substances

Nucleic acids function largely because their structure is defined by the sequence of nucleotides that make them up. The sequence allows nucleic acids to serve what function in cells?

• Nucleic acids produce the energy an organism needs in order to grow, develop, and reproduce.

• Nucleic acids provide the instructions to build proteins that make up cell structures and perform cell processes.

• Nucleic acids are embedded in cell membranes and assist in bringing food molecules in and waste molecules out of the cell.

• Nucleic acids form the three dimensional shape needed for the reactants of most biochemical reactions to bind and interact.

Which answer choice is MOST LIKELY to represent a carbohydrate?

• Carbon, Hydrogen, Oxygen

• Carbon, Hydrogen, Oxygen, Phosphorous

• Carbon, Hydrogen, Nitrogen, Oxygen

• Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorous

Ribosomes function within cells to join amino acids together to form a polymer chain. What type of macromolecule is formed by these joined amino acids?

• Carbohydrate

• Lipid

• Nucleic acid

• Protein

Many species of multicellular organisms contain specialized tissues that function in accumulating biological macromolecules for long-term energy storage. Which macromolecule type is MOST important to accumulate in these tissue types to achieve this function?

• Carbohydrate

• Lipid

• Nucleic acid

• Protein

In plants, the enzyme that catalyzes the reaction where carbon dioxide is converted into carbohydrates is called RuBisCO. Which describes the role that RuBisCO plays in this reaction?

• RuBisCO alters what products are formed during the reaction.

• RuBisCO is consumed when carbohydrates are formed by the reaction.

• RuBisCO lowers the activation energy so the conversion can occur more easily.

• RuBisCO creates energy that combines with carbon dioxide to start the reaction.

The oldest fossils are those of tiny bacteria, which are classified as prokaryotes. Why are these organisms classified as prokaryotes?

• They are the first organisms that appeared on Earth.

• They consist of cells that lack any genetic information.

• They are single-celled organisms that no longer exist on Earth.

• They are single-celled organisms that lack internal membrane-bound organelles.

Plant cells and animal cells have many structures in common. Which structure is present in plant cells but absent in animal cells?

• Nucleus

• Cell wall

• Mitochondria

• Cell membrane

Which statement below best describes mitochondria in the cell?

• Producing carbohydrates using air molecules, water, and light

• Assembling and packaging lipids that will be exported from the cell

• Transporting molecules across the cell membrane through facilitated diffusion

• Providing energy molecules called ATP for the cell to use in biochemical processes