Question

Cells and Viruses

Observe and draw the following cells.  

Plant cell (slide) – Note cell wall, chloroplast

What does this tell you about the functions of this cell?

Pancreatic cell (slide) – Note large amounts of endoplasmic reticulum and ribosomes.

What do these structures reveal about its function?

Virus (Electron micrograph) – Note the lack of organelles. Why do viruses need to infect a host cell to reproduce?

  Table 1

	Drawing of Cell Include total magnification	Organelles observed	Summarize your relationship between the cell’s anatomy and function.
Plant Cell
Pancreatic Cell
Virus

Tissues Dense regular connective tissue

You can determine function from the types and placement of the fibers. Look at the two slides.

Slide 1 – Dense regular unilateral fibers

Slide 2 – Dense regular fibers swirl in more than one direction.

Which do you think undergoes forces in many directions?

Which supports forces in predominantly one direction?

Table 2 Summary of Epithelial Tissue Analysis

Tissue Type	Draw the tissue which represents the relevant structural features. Be sure to include total magnification!	Describe the structure or form of this tissue	Location in Animal Body (possibly indicated on the slide)?
Simple Squamous
Simple Cuboidal
Simple Columnar

Fish	Tuna	Catfish	Flounder	Butterfly Fish
Body Shape (long and sleek, squat, or laterally compressed)
Tail (Forked or rounded)
Mouthlocation / shape (top, middle or bottom of head)
Coloration or markings
Other notable features
Through an investigation of the physical characteristics of each fish, what can you conclude about the fish’s habitat or lifestyle?

  

  

  

Answer 1

- Cells and viruses

Let us draw our cells and then we can discuss about them:

Now, let us discuss the organelles and function:

Plants: Cell wall, a lot of chrloroplasts. This cell is a phtosynthetic cell, its function is to produce energy for this and other tissues.

Pancreatic: A lot of endplasmic reticulum and ribosomes. This cell is undergoing a lot of protein translation, this cell is secreting proteins for other tissues

Virus: No organelles at all. This particle cannot really do anything on its own, it only has genetic material to be expressed by a cell

- Connective tissue

Which do you think undergoes forces in many directions?

The dense regular fibers swirl in more than one direction shown in slide 2

Which supports forces in predominantly one direction?

The dense regular unilateral fibers shown in slide 1

- Epithelial tissue

Let us make our drawings and then we'll discuss:

Let us discuss:

Squamous: These cells are flattened resembling a scale. It is found in tissues that require rapid difussion, like capillaries.

Cuboidal: These cells are voluminous, equally voluminous to all sides forming a cube like structure. It is found in many gland tissues, like the mammary glands or the ovaries.

Columnar: These cells are also voluminous but they are elongated in one axis, leading to a more rectangular shape. It is found in the digestive tract lining as it works for absorption, secretion and protection.

- Fish

Let us fill our table:

	Tuna	Catfish	Flounder	Butterfly fish
Body shape	Long and sleek	Long and sleek	Squat	Laterally compressed
Tail	Forked	Forked	Rounded	Rounded
Mouth	Middle	Middle	Top	Middle
Coloration	Regular gray	Reguar gray	Brown	Bright colors
Other features	A very slender tail base, and a very hydrodynamic shape	Has whiskers	It seems to camouflage in the soil	The cone like mouth
Conclusion	This one is pelagic, swims fast, most likely lives far away from coasts	This one is pelagic, most likely also wims fast, most likely interacts with the ground and coast	It is a fish living in the soil, most likely captures fish swimming above it	This one most likely lives in reefs where bright colorations are common, lives near the coast