Test 1 Review Questions Flashcards

0
Q

what is an element

A

a substance that cannot be converted to simpler substance by ordinary chemical reactions

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1
Q

What components make up an atom?

A

nucleus, protons, neutrons, electrons

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2
Q

In what way do atoms differ from one another?

A

They have a different number of protons

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3
Q

How do protons and electrons relate to the chemical properties of atoms and molecules?

A

The protons determine what the atom is

it has the same number of electrons as it does protons

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4
Q

What is an ion?

A

an electrically charged particle

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5
Q

Why do ions form?

A

form when an atom gains or loses one or more elctrons

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6
Q

What happens when ions dissolve in water?

A

Their bonds are broken

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7
Q

What are the four categories of biologically important molecules?

A

Carbohydrates
Lipids
Polymers
Macromolecules

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8
Q

What elements are important for each category?

A

Carbohydrates - carbon, hydrogen, oxygen

Lipids - carbon and hydrogen

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9
Q

What are the basic functions for each category

A

Carbohydrates - store energy in chemical bonds
Lipids - long term energy storage
Polymers - single units, most biologically important molecules
Macromolecules - all ⬆️

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10
Q

What are some reasons simple molecules are formed into polymers

A

It makes them more complex

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11
Q

How are triglycerides composed

A

composed of 3 fatty acids

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12
Q

How are triglycerides and phospholipds similar and different

A

They both have fatty acids

Tri have three

Phospholipids have a phosphate group instead of glycerol

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13
Q

What does it mean to say glucose contains energy?

A

Contains bonds that can be broken to create energy

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14
Q

How is energy Released?

A

exergonic reactions

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15
Q

Three components of a nucleotode

A

phosphate
5-C sugar
Base

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16
Q

How are nucleotides joined together in a polymer

A

condensation reaction

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17
Q

Which nucleotide polymer is double stranded

18
Q

Which nucleotides are complemetary

Why

A

A-T/U
G-C
A and G are Purines
and T, C and U are Pyrimidines

19
Q

What are the three types of RNA

A

mRNA (messenger)
tRNA (transfer)
rRNA (ribosomal)

20
Q

What are the components of all amino acids

A
Amino group
Carboxyl group
R side chain
Hydrogen 
Carbon
21
Q

Why is the similarity of amino acids important for the formation of peptide linkages

A

The amino acid and the Carboxyl group react together

22
Q

What kind of bonds holds together protein structures?

A

Primary- peptide bonds

Secondary and tertiary - Hydrogen bonds

23
Q

Why is protein shape so important?

A

Shape affects function

24
What effects do enzymes have on the energy barrier and reaction rate?
Enzymes make things happen faster | It lowers the energy barrier
25
What does it mean to denature a protein?
change it's shape | it will no longer work
26
What factors cause a protein to denature?
Heat, alterations in concentration of H+ and high concentrations of polar substances
27
How do feedback loops allow cells to control their chemical processes?
They tell the cell if it needs more and should continue to make what it's making or if it should stop
28
How do prokaryotes and eukaryotes differ?
Prokaryotes - no nucleus or membrane bound organelles | Eukaryotes- have a nucleus
29
What are the three domains of life?
Archea Bacteria Eukarya
30
What domain contains all multicellular life?
Eukaryotes
31
What does it mean for organelles to be membrane bound? How does it contribute to cell organization
It keeps things separate
32
What molecule forms the basis for biological membranes?
Phospholipids
33
What types of molecules are embedded in a membrane or attached to membranes
Carbohydrates | Proteins
34
What biological process depend on their membranes for their function and why?
Mitochondrion and chloroplast
35
How do membranes maintain differences between the space inside the membrane and the space outside?
the are selectively permeable
36
How can molecules cross membranes?
if the match the protein and and move through it
37
What does it mean to be gradient?
difference across the membrane
38
How do gradients relate to diffusion, osmosis, and active and passive transport
molecules move to where the concentration is lower to even it out.
39
What is meant by signal transduction pathway?
short and long term resononses
40
What starts the pathway?
a signal molecule connects with the recptor
41
What are the steps in the pathway
involves enzymes and proteins
42
What ends the pathway?
a cellular response
43
How do the steps along the way pass on the signal?
phosphorylation transmits the signal to thenext enzyme | kinase phophorylates the other molecules