Summey #4 Biology EoC

Which of these best compares how the structure of the phospholipid is so perfectly paired to the function of the cell membrane?

• A. Lipids contain high energy bonds, and these bonds help to provide the energy to move molecules across the membrane.

• B. Phospholipids are bulky/large molecules that prevent all molecules from entering/exiting the cell.

• C. The head of the phospholipid, which is hydrophilic, helps to control the movement of large hydrophobic molecules, and the tails of the phospholipid, which are hydrophobic, help to control the movement of large hydrophilic molecules.

• D. The polar tails of the phospholipids provide the barrier between the exterior/interior hydrophilic environments.

Rachel saw this rod-shaped organism under the microscope. With further tests, Rachel noticed that the organism was single-celled and did not contain a nucleus. Which of these did Rachel conclude was the best way to classify this organism?

• A. bacteria

• B. virus

• C. fungus

• D. protist

Which of these gives support for the statement: Compartmentalization in eukaryotic cells improves the efficiency of cellular processes.

Responses

• ACompartmentalization maximizes the surface area where cellular processes can occur.

• B. Compartmentalization in eukaryotic cells increases competition, preventing multiple processes from occurring at once.

• C. Compartmentalization decreases the surface area to volume ratio in eukaryotic cells.

• D. Compartmentalization of eukaryotic cells depends on extracellular membranes what aide in transport of materials and wastes generated in cellular processes, maximizing efficiency.

A researcher claims that all living cells must be able to synthesize proteins in order to maintain homeostasis and perform basic functions. What statement supports the scientist's claim?

• A. Cell walls are required for cells to maintain their shape to manufacture proteins. All cells must have cell walls

• B. Nuclei house the DNA, which is the blueprint for proteins. Only cells with a nucleus can synthesize proteins.

• C. Ribosomes are required for protein synthesis so all cell must contain ribosomes.

• D. Cells require lysosomes to digest cellular components to convert them into proteins. Only cells with lysosomes can synthesize proteins.

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What differentiates animal cells from plant cells? Select ALL that apply.

• A. Animal cells lack vacuoles.

• B. Animal cells lack chloroplasts.

• C. Animal cells have fewer chloroplasts

• D. Animal cells have centrioles.

Which of the following is true about nucleic acids? SELECT ALL THAT APPLY.

• The body's go to for an energy source and an energy storage molecule.

• Made of sugar, phosphate and nitrogen-containing bases.

• This is a macromolecule that carries the cell's genetic information in a coded form.

• DNA and RNA are two types.

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Which molecule in the picture is most favored by mitochondria and used by the body as quick energy?

• A. glycogen

• B. sucrose

• C. glucose

• D. triglyceride-saturated

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A cell with 1% solute concentration is placed in a beaker with a 5% solute concentration. What will happen to this cell over time?

• A. The cell will lose H₂O and shrink.

• B. The cell will both gain and lose equal amounts of H₂O ; thus, it will remain the same size.

• C. The cell will undergo no exchange of H₂O with its surroundings.

• D. The cell will gain H₂O and expand.

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These are red blood cells. Which cell is in a hypertonic solution? How do you know?

• Cell A (left) because there is more solute inside the cell and water is moving in.

• Cell C (right) because the water is leaving the cell so it can bring the cell to homeostasis with its environment.

• Cell B (middle) because it is in homeostasis.

• None of these cells are in a hypertonic solution because they didn't pop.

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250,000 grams is ________ kilograms.

• A.25

• B. 0.25

• C. 250

• D. 2500