week 1: basic chemistry Flashcards

1
Q

What are atoms?

A

Smallest stable units of matter.

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2
Q

Define elements.

A

A pure substance, consisting only of atoms of the same type (i.e. with the same atomic number).

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3
Q

What are molecules and compounds?

A

Substances consisting of atoms of one or more elements, joined together by a chemical bond.

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4
Q

What is a chemical bond?

A

An attraction that links atoms and ions together.

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5
Q

What are covalent bonds?

A

Involve the sharing of valence electrons between atoms to fill their outer electron shell.

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6
Q

What is a polar covalent bond?

A

When the electrons are distributed unequally, creating an asymmetrical (polar) molecule.

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7
Q

What occurs in a water molecule regarding polar covalent bonds?

A

The 8 protons of the O atom have a much stronger attraction for the shared electrons than the single protons of the H atoms.

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8
Q

What is a non-polar covalent bond?

A

When the electrons are equally shared between the atoms and there is no net electrical charge difference across the molecule.

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9
Q

What are ionic bonds?

A

Involve the transfer of valence electrons between atoms, forming a stable ionic compound with a neutral charge.

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10
Q

What characterizes metallic bonds?

A

Metallic atoms share their electrons, creating a sea of freely-moving electrons.

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11
Q

List three properties of metallic bonds.

A
  • Very strong (high tensile strength)
  • Malleable and ductile
  • Good conductors of electricity and heat.
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12
Q

What are Van der Waals bonds?

A

Attractive forces between a positively charged region on one molecule and a negatively charged region on a neighbouring molecule.

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13
Q

What are London dispersion bonds?

A

Occur between non-polar molecules due to momentary dipoles created by moving electrons.

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14
Q

What are dipole-dipole bonds?

A

Occur between polar molecules when their -ve and +ve regions interact.

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15
Q

What are hydrogen bonds?

A

Attractive bonds between a hydrogen atom covalently bonded to a very electronegative atom and another.

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16
Q

What is one significant role of hydrogen bonds in biology?

A

Responsible for secondary/tertiary/quaternary protein structure.

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17
Q

How do hydrogen bonds affect the physical properties of water?

A
  • High boiling point
  • High surface tension
  • Ice floats due to less dense structure.
18
Q

What are intramolecular bonds?

A

Hold molecules together.

19
Q

What are intermolecular bonds?

A

Occur between molecules.

20
Q

supports organelles and cell shape & plays a role in cell motion

A

cytoskeleton

21
Q

tube of protein molecules present in cytoplasm, centrioles, cilia and flagella

A

microtubules

22
Q

intertwined protein fibres that provide support and strength

A

intermediate filament

23
Q

twisted protein fibres that are responsible for cell movement

A

actin filament

24
Q

complex assembly of microtubules that occurs in pairs

25
Q

semifluid matrix that contains the nucleus and other organelles

26
Q

command center of cell

27
Q

site where ribosomes are produced and rRNA synthesis

28
Q

double membrane between the nucleus and cytoplasm

A

nuclear envelope

29
Q

opening embedded with proteins that regulate the passage into and out of the nucleus

A

nuclear pore

30
Q

small complexes of RNA and protein that are the sites of protein synthesis

31
Q

system of internal membranes that aid in the manufacture of carbohydrates and lipids, lack ribosomes, contain unique enzymes and participate in detoxification

A

smooth endoplasmic reticulum

32
Q

internal membranes studded with ribosomes that carry out protein synthesis

A

rough endoplasmic reticulum

33
Q

vesicle that breaks down macromolecules and digests worn out cell components

34
Q

collects packages and distributes molecules manufactured in the cell- packages proteins exiting the rER 3-20 cisternae

A

golgi complex

35
Q

lipid bilayer in which proteins are embedded

A

plasma membrane

36
Q

functions of the nucleus?

A

house genetic material, regulate expression of genes and produce ribosomal subunits

37
Q

compated DNA, DNA wraped around proteins

38
Q

euchromatin

A

dispersed, lightly stained, active cell

39
Q

heterochromatin

A

highly condensed, intensely stained, inactive cell

40
Q

varies in composition and consistency, 75-90% water and 10-25% dissolved/suspended. intracellular fluid that surrounds organelles making 55% of total cell volume

41
Q

golgi dysfunction leads to

A

CNS: ischameic stroke
LUNG pulmonary artery hypertensin
GASTRO: Gastric cancer + colon cancer
LIVER: Hepatitis