Exam 3: Life Is Cellular

During the process of ________,water diffuses across a semipermeable membrane from an area where water is more concentrated to an area where water is less concentrated (it moves along the water concentration gradient).

The smooth endoplasmic reticulum

You are a scientist observing a membrane through which water and some small hydrophobic molecules can freely pass along a concentration gradient from high to low.However,some sugar molecules are too large to pass through the membrane either way without the assistance of passive transport proteins.Additionally,small Na⁺ ions and some proteins can pass through the membrane against the concentration gradient,but both require the assistance of active transport proteins.What general type of membrane are you observing?

Match the following cellular structures with their primary function (you may need to use a function more than once). -smooth endoplasmic reticulum

Living cells have an intact phospholipid bilayer that separates the cell from its external environment;this structure is commonly referred to as the

Match the following cellular structures with their primary function (you may need to use a function more than once). -ribosomes

Which of the following statements is true of chloroplasts?

A factory with an office that controls the information sent to separate rooms for each of the manufacturing and shipping processes would be analogous to

Which of the following statements most accurately describes a selectively permeable membrane?

A white blood cell (WBC)encounters bacteria in a scrape on the knee of a child who has fallen off of his bicycle.The WBC's job is to take the bacteria inside of itself and destroy the bacteria.If the bacteria cannot be moved across the WBC membrane,how will the WBC most likely take it in?

Why do scientists repeat their experiments over and over again?

Which of the following types of organisms are commonly single-celled (unicellular)?

Match the following cellular structures with their primary function (you may need to use a function more than once). -cytoskeleton

________ transport of molecules across a selectively permeable membrane requires the input of energy from the cell whereas ________ transport of molecules across a selectively permeable membrane does not require the use of cellular energy.

The flexible poles providing structure to a soft-sided tent most closely resemble the

Which of the following would be likely to require facilitated diffusion to move across the plasma membrane?

If the concentration of sugar molecules in water on side "A" of a selectively permeable membrane is 5 percent,and the concentration of sugar molecules in water on side "B" of a selectively permeable membrane is 15 percent,which way will the water move and why?

Cells naturally,without using energy,respond to changes in water concentration through the process of

There are cells in your pancreas that produce insulin,a peptide hormone important in the regulation of blood sugar levels by adjusting the metabolism of sugars and fats.Once the pancreas cells have produced the initial peptide (small string of amino acids)component of insulin,it must be finished,packaged,and shipped out of the cell.Which organelles would likely be involved in this process of finishing,packaging,and shipping of a peptide hormone? Include a brief,general description of what happens to the hormone at each organelle.

Which of the following is/are part of accepted cell theory?