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ASU BIO 181 EXAM 1 LATEST -
QUESTIONS AND CORERCT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+
What limits the paramecium from acquiring more complex functions? - ANSWER- The number of bimolecular machines it can fit within its "space". The existing bio-machines must repurpose themselves completely to complete a task, which means it can't fully 'automate' itself.
What organ is the contractile vacuole assumed precursor to? - ANSWER- Kidney - both systems expel excess; CV with extra water and the kidney expelling waste via urine (water + ick)
T/F The paramecium swims by way of using a flagella - ANSWER- FALSE
- The paramecium moves using cilia
A cell that is itself an organism must have a minimum of four needs presented in lecture. List these four things. - ANSWER- 1.
REPRODUCTION
2. FINDING A MATE
3. FOOD
4. SHELTER
A cancer cell is: - ANSWER- Anchorage INDEPENDENT and
IMMORTAL
A normal cell is: - ANSWER- Anchorage DEPENDENT and MORTAL
The loss of the ____ _____ was the first step for development in the Endomembrane theory - ANSWER- Cell Wall
What limitations exist with cell culture techniques? - ANSWER- 1. Not all cells grow in a culture
- The "shape" (histotype and structure) changes
- The metabolism can change
As a cell 'walks', list the order of events: - ANSWER- 1. flattens
- filipodia
- lamellipodia
- cell muscle ( actin and myosin)
- cell "superglue"
- retraction fiber
Do cancer cells experience contact inhibition? - ANSWER- NO. They will continue multiplying under any circumstance.
T/F The cytoskeleton gave rise to the nuclear envelope. - ANSWER-
FALSE.
What is the outer boundary of life in a prokaryotic cell? - ANSWER- Plasma Membrane
Explain oxygen conditions in ancient earth. - ANSWER- There was not a lot of it around, and it was toxic to most living things at the time.
T/F DNA in extant prokaryotic cells is circular. - ANSWER- TRUE
How was it thought that cells filtered ancient oxygen? Why? - ANSWER- Oxygen was toxic; so it is thought that peroxisomes evolved in proto-eukaryotes to filter it.
Association with ribosomes and *what* would support the endomembrane theory? - ANSWER- Membrane invaginations - the concept of ribosomes latching on to these invaginations is what the endomembrane theory poses gave creation to the RER.
Why was motility important to proto cells? - ANSWER- It allowed them to flee predators and move towards food.In Cell Biology what can limit the progress of science?Technology- no method is perfect
Which of the cell types below are not responsible for finding food?
- Macrophage - initiates immune system
- Lymphocyte - helps fight cancer and infection
- Fibroblast - forms connective tissue
T/F Cells in your body with different functions have the different DNA.FALSE - every cell in your body contains the same DNA, just different parts are activated
What major difference separates us (humans and multi-celled organisms) with single celled eukaryotes?
Multicellular organisms utilize "Division of Labor"- the idea that organelles specialize certain tasks so that the unit of the whole can thrive.
Define anchorage dependence.In order to grow and divide, a cell must be attached to a solid surface.
Define contact inhibition.When cells come into contact with a neighbor, they stop dividing and the layer of cells remain one-cell thick.
T/F A cell that is anchorage-dependent for growth will also exhibit contact inhibition.
TRUE
What limits the paramecium from acquiring more complex functions?The number of bimolecular machines it can fit within its "space". The existing bio-machines must repurpose themselves completely to complete a task, which means it can't fully 'automate' itself.
What organ is the contractile vacuole assumed precursor to?Kidney - both systems expel excess; CV with extra water and the kidney expelling waste via urine (water + ick)
T/F The paramecium swims by way of using a flagella FALSE - The paramecium moves using cilia
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