Bio- U2 Post- study guide-cells

Which statement about active transport is most accurate?

• Active transport utilizes energy from ATP molecules.

• Active transport is essential to move water into and out of a cell.

• Active transport is the only way to move ions into and out of a cell.

• Active transport is required to move ions into and out of a cell.

Single-celled pond organisms have contractile vacuoles that maintain water balance within each cell. This is an example of what osmotic principle?

• buffering

• homeostasis

• osmosis

• photosynthesis

Which process involves the movement of molecules across the plasma membrane from areas of high to low concentration without any assistance or energy from the cell?

• active transport

• diffusion

• facilitated diffusion

• metabolism

How does the fish maintain homeostasis during the process of osmoregulation?

• by retaining water and eliminating salt by osmosis

• by retaining salt and eliminating water by osmosis

• by retaining salt and eliminating water by active transport

• by retaining water and eliminating salt by active transport

Hemoglobin serves as a buffering agent in the human blood by acting as a weak acid and a weak base. How does this property of hemoglobin help the human body?

• It helps in maintaining a constant pH.

• It helps in regulating water uptake.

• It helps in regulating enzyme activity.

• It helps in maintaining constant temperature.

A student with swollen gums gargles with warm salt water and experiences decreased swelling. Which statement best explains what has occurred?

• The high temperature of the warm salt water kills all infection-causing microbes.

• The saltwater solution is absorbed by cells in the gums.

• The water in the gums moves from a high to a low concentration of water.

• The salt in the saltwater solution is transferred into the cells through passive transport.

What cell structure's primary role is cellular mobility?

• eyespot

• pseudopod

• ribosome

• vacuole

Which structure is specialized for the detection of the stimulus that triggers a phototaxis response in certain protists?

• cell wall

• contractile vacuole

• eyespot

• flagellum

Membrane-bound organelles would be found in which type of cells?

• animal cells only

• eukaryotic cells only

• prokaryotic cells only

• plant cells only

Which statement describes the difference between the DNA of a prokaryotic cell and a eukaryotic cell?

• Eukaryotic cells have circular DNA contained in a nucleus.

• Eukaryotic cells have DNA contained in chromosomes not inside a nucleus.

• Prokaryotic cells have circular DNA not contained in a nucleus.

• Prokaryotic cells have DNA contained in chromosomes inside a nucleus.