BISC 101 Lecture Notes - Interphase, Mitosis

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chocolateporcupine218

7 Feb 2012

School

Simon Fraser University

Department

Biological Sciences

Course

BISC 101

Professor

Christopher Kennedy

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Document Summary

Cell y all living organisms are made of cells y 2x1014 cells= 200 trillion in a human body y all cells derived from pre-existing cells y organisms maybe single celled (amoeba/bacteria) or complex/multiple (humans) Cell features: structure, function, reproduction (division, cell-cycle. Multicellar organisms y cell cycle, infinite mitosis is a part of this. *in each cell there is 2 meters of. Mitosis: prophase chromosomes appear, with sister chromatid y y mitotic spindle (microtubules) forms in cytoplasm, prophase y nuclear envelope breaks down y microtubules organize at polar of cell y kinetochore forms at centromere, microtubules attach. Fig 12. 7: metaphase chromosomes migrate to center of cell and align accordingly to centromeres. Fig 12. 10 y y spindle apparatus is complete: anaphase y chromosomes separate and migrate to poles of cell, telophase two nuclei form cytokinesis occurs y y y 3 genetically identical cells from y nuclear envelope forms.

Related Questions

1. You observe that small crustaceans swimming through a sample of ocean water set off light production, but your first guess is that this is due to some bacterium, since bacteria are so metabolically diverse. True or false

2. How did multicellular organisms evolve from unicellular organisms?

Single-celled organisms joined together, or failed to separate after cell division.

Single-celled organisms joined together only.

Single-celled organisms failed to separate after cell division only.

Single-celled organisms joined together, or absorbed other species by endosymbiosis.

One species absorbed another species by endosymbiosis only.

3.Cooperation between or among cells could have been a key step in the evolution of multicellularity.

True

False

4. Autotrophs must acquire carbon from organic molecules produced from other organisms.

True

False

5. The protists, though now known to have multiple origins, were first group due to their being aquatic, and, most of them, quite small.

True

False

6. You are analyzing samples under a microscope, and one sample coming from what you suspect is a fungus. You find tiny filaments, which, in your report, you call

hyphae.

spores.

fruiting bodies.

7. Fungi are classified into phyla based on which characteristic?

organelles

composition of cell wall

photosynthesis

reproductive structures

multicellular vs. unicellular

gills.

chitin.

You are studying two populations of dung beetles, one of which rolls their dung balls at noon, resting at night, and the other of which reverses this. These could speciate due to

behavioral isolation.

gametic isolation.

mechanical isolation.

temporal isolation.

sexual selection.

TAKING EXAM NOW, need fast please!

Colonial eukaryotic organisms will differ from single celled eukaryotic organisms in that:

a. all cells observed will not have a nucleus

b. multiple identical cells will be visible in the colonial eukaryote.

c. single-celled eukaryotes will be more complex

d. colonial eukaryotes will share a nucleus between multiple cells

orchidwasp423

Reproduction: Explain why asexually reproducing organisms are generally found in environments that do not change very much through time, while sexually reproducing organisms are very successful in environments that change dramatically through time.

BISC 101 Lecture Notes - Interphase, Mitosis

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