Benchmark 3 remediation

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Multiple Choice

How does a cell maintain homeostasis?

• 
  by selectively allowing nutrients in and eliminating excess ions and waste material

• by keeping the DNA contained within the nucleus so that mRNA can produce proteins

• by creating an isolated location for mitosis and meiosis to create new cells during cell division

• by creating a nitrogen-rich environment suitable for the production of amino acids and proteins

Multiple Choice

Which subunits make up DNA?

• fatty acids

• monosaccharides

• amino acids

• nucleotides

Multiple Choice

When would a buffer system become activated in a human?

• after exercise, when the body temperature has increased

• after exercise, when the bloodstream pH is acidic, because excess CO₂ is present

• 
  when too much salt has been ingested, causing the blood to become hypertonic

• when too many carbohydrates have been ingested, raising blood glucose levels

Multiple Choice

What is the purpose of the thylakoid membranes in the chloroplast?

• to increase the amount of DNA present

• to maintain energy production

• to decrease surface area for light release

• to increase surface area for light absorption

Multiple Choice

Which structure is found in both eukaryotic and prokaryotic cells?

• vacuole

• nucleus

• plasma membrane

• mitochondrion

Multiple Choice

A student observes a slide under the microscope and sees a cell that has a cell wall, chloroplasts, and a large vacuole. How should the student classify this cell?

• as a eukaryotic animal cell because it has a cell wall and chloroplasts

• 
  as a prokaryotic plant cell because it has a cell wall and a large vacuole

• as a prokaryotic animal cell because it has a cell wall and a large vacuole

• as a eukaryotic plant cell because it has membrane-bound structures and chloroplasts

Multiple Choice

What occurs to an enzyme after it breaks down a substrate?

• It is broken down and becomes unusable.

• It is slightly altered and binds to a different substrate.

• It attaches to another substrate.

• It changes shape and uses ATP to bind to another substrate.