Lab 5. Cells

Organelles Like mini organs within the cell, each with a

particular function but that function together in systems

Major ones are: Endoplasmic reticulum, mitochondria, nucleus, golgi, plasma membrane, lysosomes, ribosomes, peroxisomes

Cell Division From one parent cell, two identical

“daughter” cells are produced Mitosis: first copies, then divides all the

DNA in a cell to place into the two daugther cells

Cytokinesis: divides the cytoplasm in half to create two complete cells.

Stages of cell cycles Interphase Mitosis = PMAT:

Prophase: nuclear envelope disappears, spindle starts to from, chomosomes become visible

Metaphase: Chromosomes line up at middle (metaphase plate)

Anaphase: chromosomes separate Telophase: nuclear envelope reforms,

chromosomes decondense

Cytokinesis Occurs at roughly the same time as

telophase. Cleavage furrow divides the cytoplasm

making two complete daughter cells.

Today Lab exercise #5 Activities:1. Look over membrane structure and cell

model2. Label Figure 5.2, Fill in Table 5.2 (easier

after Thursday’s lecture)3. Look at onion root tip slides OR whitefish

slides, locate and draw an example of each phase on piece of paper provided

What to look for… Interphase: most cells (like 95%) will be in

interphase. Can’t distinguish the chromosomes

P: early spindle forming, start to see chromosomes

M: chromosomes all lined up at middle A: chromos clustered around each pole T: cleavage furrow (cytokinesis)

To Turn in: Drawings of the 6 stages Table 5.2 and Figure 5.2 Sections D and F of the Lab Report