CH 3 SG Flashcards

1
Q

2 parts of cell theory

A

(unifying principle of biology/cells are highly organized)
-Every living organism is composed of one or more cells
-All cells living today came from a preexisting cell

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2
Q

Microscope importance

A

(they allow us to see things that are too small to see with the naked eye)

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3
Q

Men responsible for first discovering / describing cells

A

-Cells were first observed by Robert Hooke in 1665.
-Working with more refined lenses, Antoni van Leeuwenhoek later described
– blood,
– sperm, and
– organisms living in pond water

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4
Q

Light microscope (LM)

A

Specimens can be magnified up to 1,500 times the actual size of the specimen (LM limit of resolution ~ 0.2μm)

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5
Q

Cell size

A

(It’s limited)
• be large enough to house “stuff”
• remain small enough to allow for a surface-to-volume ratio that will allow adequate exchange with
the environment.

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6
Q

Structure and functions of cell membranes (fluid mosaic model)

A

a flexible, fluid bilayer of phospholipids with various proteins embedded within, creating a mosaic-like appearance where the proteins can move laterally within the membrane, allowing for diverse functions like transport and cell signaling

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7
Q

Importance of compartmentalization in eukaryotic cells

A

(It is efficient) preventing interference in different biochemical pathways enhancing the cell’s functionality

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8
Q

Chloroplasts structure

A

have a complex system of stacked, disc-like sacs called thylakoids within their inner membrane

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9
Q

Mitochondria and chloroplasts - Endosymbiotic Theory

A

(They both have DNA/mitochondria and chloroplast are similar to bacteria in size and structure)(Explanation of the evolution of eukaryotic organelles by phagocytosis of prokaryotes)
The eukaryotic host cell has the ability to utilize oxygen/synthesize organic food when the prokaryote was taken up and not destroyed after the two live together cooperatively

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10
Q

Structure and function of the cytoskeleton

A

provides structural support, maintains cell shape, organizes organelles, and facilitates cell movement by acting as a track for intracellular transport

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11
Q

magnification

A

is the increase in the apparent size of an object

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12
Q

resolution

A

is a measure of clarity (the ability to
show two close objects as separate)

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13
Q

Electron microscope (EM)

A

Instead of light, EM uses a beam of electrons
• Electron microscopes
– have resolution ~ 50pm
– can magnify up to 10,000,000 times

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14
Q

Scanning electron microscopes
(SEM)

A

Scans cell surfaces

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15
Q

Transmission electron microscopes
(TEM)

A

internal cell structure

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16
Q

Surface-area-to-volume ratio

A

(one big cell is not efficient) ratio of a cell’s outside area to it’s internal volume; the relationship limits the maximum size of a cell

17
Q

Benefits of multicellularity

A

(increase the size without its limitations) the ability to grow larger, increased complexity due to cell differentiation, better adaptation to diverse environments, improved predator avoidance, and longer lifespans

18
Q

Phospholipid molecules structure and properties of cell membranes

A

-primary building blocks of cell membranes
-forming a lipid bilayer structure due to their amphipathic nature
-a hydrophilic (water-loving) head group containing a phosphate molecule
-two hydrophobic (water-hating) fatty acid tails

19
Q

Cell Wall

A

Protects the cell, makes it fim. Provides support and protection, only found in plant cells

20
Q

Cell Membrane

A

Seperates the cell from other cells, controls what enters and/or leaves the cell

21
Q

Vacuole

A

Storage areas for food, minerals, and waste, mostly filled with water, and helps the plant with support. The plant cell has one.

22
Q

Nucleus

A

Body in the center of a cell that contains RNA and DNA. Is the control center of the cell and is responsible for activities like reproduction and growth.

23
Q

Nucleolus

A

(dark-staining, spherical body in the nucleus that produces ribosome subunits) In the Nucleus, contains RNA (ribosomal RNA (rRNA))

24
Q

Chloroplast

A

Contains chlorophyll, site of photosynthesis

25
Q

Mitochondria

A

Produces energy, power house and centre of respiration of the cell (have folded inner membranes cristae/open space matrix)

26
Q

Golgi Bodies

A

Tube-like structures that have tiny sacs in the ends; helps package protein. Receives materials from endoplasmic reticulum and sends them to other parts of the cell.

27
Q

Cytoplasm

A

Clear, thick fluid that contains organelles, outside nucleus and inside cell membrane (helps cells expand during reproduction)

28
Q

Organelle

A

Cell parts with specialized functions

29
Q

Chromosomes

A

Thread-like structures composed of DNA. Form of an X. Made up of to chromatids

30
Q

Chromatids

A

Following replication, a chromosome consists of a pair of sister chromatids, held together at the centromere; each chromatid is comprised of a single DNA helix

31
Q

DNA

A

Nuclic acid polymer produced from covalent bonding of nucleotide monomers that contain the sugar deoxyribose; the genetic material of living organisms

32
Q

Golgi Apparatus

A

A complex of vesicles and folded membranes within the cytoplasm (organelle, consisting of sacs and vesicles that processes, packages, and distributes molecules about or from the cell)

33
Q

Ribosomes

A

Small particles of RNA and protein found throughout the cytoplasm. Their main function is to synthesize proteins for use throughout the cell.

34
Q

Lysosomes

A

Cell organelles filled with digestive enzymes need to break down certain materials in the cells

35
Q

Endoplasmic Reticulum (ER)

A

The transportation system of the cell. It moves materials around the cell (Passageway for material that moves around the cell)

36
Q

Rough ER

A

(protein synthesis)
Membranous system go tubules, vesicles, and sacs in cells; has attached ribosomes

37
Q

Smooth ER

A

(Makes lipids and carbohydrates)
Membranous system of tubules, vesicles, and sacs in eukaryotic cells; site of lipid synthesis; lacks attached ribosomes