Exam 3: Life Is Cellular

Ribosomes are very small nonmembranous organelles that can either exist freely in the cytoplasm or be embedded in the endoplasmic reticulum of a cell;they are associated with the synthesis of

Examine the figure below.If each sugar molecule represents a percentage point of sugar dissolved in the solution,what change would you expect to see in the solution level over time and why?

All cells have a ________ that acts as a barrier separating the cellular components from the external environment.

When scientists such as J.C.Venter and Daniel Gibson engineer a cell constructed with synthetic DNA in the laboratory,do they challenge accepted cell theory? If so,which part of cell theory do they challenge? Briefly explain your answer.

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

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

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

A long piece of ribbon wired along both long edges is twisted into a helix and wrapped around individual pipe cleaners that have been rolled into spools;this grouping is then twisted (super coiled)again to condense it.This could be best used as a simple model for

In your own words,briefly point out the primary difference between prokaryotes and eukaryotes,and then explain what might keep viruses from being included in either of these categories.

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

If a bottle of perfume were spilled in the corner of a large lecture hall,the students sitting near that corner of the room would very quickly smell the perfume.Over time,the students sitting in the far corner of the room would smell the perfume.What phenomenon has occurred to the perfume molecules that have entered the air?

Dialysis tubing is a selectively permeable membrane that can be filled with a solution to simulate a cell.A piece of dialysis tubing has been filled with a cloudy white solution of 5 percent starch, 5 percent egg albumin (protein),and 5 percent glucose (a small sugar)dissolved in water to simulate a cell.This cell is weighed and then placed in a beaker of 3 percent iodine dissolved in water.When iodine and starch are mixed together,they form a bluish-black compound that is easily seen.After soaking in the yellow iodine-water solution for one hour,the cell is once again weighed.You also notice that the solution inside of the cell is now a dark blue color while the solution in the beaker is still a light yellow color from the iodine.What do you expect to happen to the weight of the cell over time and what can you deduce from the color change?

Which of the following would be the best analogy for the function of the Golgi apparatus?

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

An animal cell that contains an extensive network of ________ is likely to be an important source of lipids and/or hormones important in the development and functioning of that animal.

Label this plasma membrane.Use the following terms: cellular environment,external environment,plasma membrane,hydrophilic heads,hydrophobic tails,energy,water,sugar,transport proteins.

The boundary that surrounds the contents of the nucleus is the

Compare and contrast the nuclear envelope and the plasma membrane.

You are in lab attempting to prepare a slide of cow blood for observation in a wet mount.You place a small drop of the blood on a slide,add a drop of strong saline (salt)solution,and then cover all of it with a coverslip.After returning to your desk,you observe the slide with your microscope and notice that all of the red blood cells (RBCs)do not look like the nice round donut shaped cells in your lab manual.Instead,the RBCs look very shriveled up.Your lab partner has also made a slide,but the RBCs on their slide do look like the ones in the lab manual;your lab partner used a more dilute solution of saline but the same vial of blood.What is the most plausible explanation for the appearance of the blood cells on your slide?

The leaves of a plant typically have different tissue layers that function in different ways.The epidermis layer functions like a covering of skin to protect the leaf while vascular bundles carry water and nutrients through the leaf.The palisade mesophyll layer is responsible for most of the photosynthesis that occurs while the spongy mesophyll layer underneath it aids in the exchange of gases (CO₂ and O₂)and water vapor.In which leaf tissues would you expect to find the highest density of chloroplasts?