Full Length Exam Weaknesses (BIO) Flashcards

1
Q

If DNA is methylated the genes are turned (on/off) because…

A

off, the methyl groups encompass their tails around the DNA, which then restricts access

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2
Q

If DNA is de-methylated, the genes are turned (off/on) because..

A

tails are loosened, allowing transcription factors access to the DNA

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3
Q

This process is a post-translational modification that attaches a negative charge to a serine, threonine, or tyrosine via a ____ group

A

phosphorylation, phosphate group

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4
Q

Phosphate groups are attached by a (type of enzyme)

A

kinase

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5
Q

This process __________, is a post-translational modification where the addition of a ____ group reduces the (+) charge on a histone, which then reduces its interaction with a (-) charged phosphate group, making the DNA less tightly wound and more accessible to gene transcription

A

acetylation, acetyl group

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6
Q

If the DAM methylation sequence is blocked, what will NOT occur?

A

methylation, meaning transposition is more likely to occur (jumping genes)

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7
Q

Hemi-Methylated DNA

A

This allows the cell to distinguish between the old strand (methylated) and the new strand (unmethylated)

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8
Q

A - T base pairs have ____ hydrogen bonds between them, which means (MORE/LESS) energy is required to separate these bonds than C-G base pairs

A

2, less energy (C-G bonds have 3 Hydrogen bonds)

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9
Q

During PCR, denaturing (1st step) occurs at what temperature?

A

approx 95 celcius

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10
Q

During PCR, annealing (2nd step) occurs at what temperature?

A

approx 50-55 celcius

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11
Q

During PCR, extending (last step) occurs at what temperature?

A

approx 72 celcius

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12
Q

The signals from healthy neurons dissipate (slower/faster) than signals from neurons affected with multiple sclerosis

A

healthy neuron signals dissipate more SLOWLY

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13
Q

This enzyme removes a phosphate group from a substrate, and uses what molecule to do so?

A

Phosphatase, a water molecule

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14
Q

A POSITIVE, INDUCIBLE system, is one in which

A

the system is ALWAYS off until turned on- and since it is positive, the regulatory protein binds the activator (ex: lac operon)

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15
Q

A NEGATIVE, INDUCIBLE system, is one in which

A

the system is ALWAYS off until turned on- and since it is negative, the regulatory protein binds a repressor, until the inducer inactivates this repressor (ex: trp operon)

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16
Q

A Repressible system is always (ON/OFF) until turned ___

A

always ON, until turned off

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17
Q

How do proteases break peptide bonds?

A

By hydrolysis

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18
Q

Hemoglobin exhibits _____ binding of oxygen, meaning that the binding of oxygen to one of the subgroups impacts binding to the other subgroups

A

allosteric binding

19
Q

Each round of beta-oxidation removes ___ carbons from a chain

A

2

20
Q

Hydrogen bonds are what type of interaction?

A

Dipole-dipole

21
Q

This type of passive transport involves a channel

A

Facilitated Diffusion

22
Q

This lab technique involves separating proteins based on their isoelectric point by running a current through a gel that contains a pH gradient

A

isoelectric focusing

23
Q

T or F; all bacteria have cell walls

A

False, most do, and some don’t

24
Q

T or F; Viruses can self replicate

A

False, viruses need a host cell (but, bacteria can self-replicate)

25
Q

In exocytosis, a (small/large) number of molecules can be expelled at once

A

large

26
Q

During the elongation stage of translation, this molecule is used to provide energy for the binding of a new tRNA to an A site

A

GTP

27
Q

The ____ process of translation occurs when the tRNA progresses to the next codon, which is provided with energy by ___

A

translocation, GTP

28
Q

What nerve innervates the diaphragm?

A

Phrenic nerve

29
Q

A reading frame shift is caused by

A

a single base pair substitution

30
Q

A substitution of one amino acid for another is caused by what type of mutation?

A

A missense mutation

31
Q

When an amino acid sequence is substituted with a stop codon, this is caused by what type of mutation?

A

A nonsense mutation

32
Q

What is the equation for ΔG

A

ΔG = ΔH–TΔS

33
Q

This type of translocation is the most common, and is when the entire long arms of nonhomologous chromosomes become fused together

A

A Robertsonian translocation

34
Q

Transcription factors are located in the

A

nucleus (where transcription occurs)

35
Q

A strong Lewis Acid is electron ____

A

poor

36
Q

A strong Lewis Base is electron _____

A

rich

37
Q

These (3) Amino Acids are basic (at a neutral pH)

A

histidine, arginine, lysine

38
Q

These (2) amino acids are acidic (at a neutral pH)

A

aspartate, glutamate

39
Q

oxidation potential (also known as ionization energy) is related to how easily an atom will (lose/gain) an electron

A

lose an electron

40
Q

What is ionization energys pattern across the periodic table?

A

It increases across a row on the periodic table, and decreases down a column

41
Q

What channel repolarizes the cell after depolarization

A

The voltage gated potassium channel

42
Q

Which channel is responsible for depolarization of the cell?

A

The voltage gated Sodium channel

43
Q

These channels maintain the resting membrane potential

A

The sodium-potassium ATPase, and potassium leak channel

44
Q

competitive inhibitors (DO/ DO NOT) alter an enzyme’s vmax and they (INCREASE/ DECREASE) kM

A

do not alter vMax, increase kM