Lecture 18 Flashcards

1
Q

What percent of the dry weight of the human body is composed by proteins?

A

44%

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2
Q

Proteins are what percent of our caloric intake?

A

5%

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3
Q

What are polysomes?

A

String of ribosomes translating a single messenger RNA

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4
Q

Which way does protein syntheses occur?

A

N to C

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5
Q

What is the name of the type of mutation that results in a stop codon?

A

nonsense

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6
Q

Eukaryotic ribosomal units?

A
  • 60s and 40s

- total 80s (doesn’t add but it is what it is)

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7
Q

What are the accessory RNA units for eukaryotes?

A
  • 5s, 28s, 5.8s
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8
Q

Prokaryotic ribosomal units?

A
  • 50s and 30s

- total 70s

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9
Q

What are the accessory RNA units for prokaryotes?

A
  • 16s
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10
Q

How many antibiotics are used to disrupt translation?

A

About half

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11
Q

How many antifungal affect process of translation?

A

None because fungal translation is so similar to human translation that it is difficult to find an agent that will disrupt fungal translation without fucking up ours.

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12
Q

how many antivirals affect translation?

A

none yet

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13
Q

what is the shape of eukaryotic mRNA and how?

A

circular due to the 4e protein that binds the 5’ cap and the Pab1 protein that binds the polyA tail (Pab1 and 4e are connected)

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14
Q

eukaryotic mRNA is ____-cistronic.

A

mono-

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15
Q

what does mupirocin do?

A

it is an antibiotic that inhibits isoleucine-tRNA synthase in bacteria

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16
Q

what is the coupled reaction that creates “activated tRNA”?

A

1) AA + tRNA + ATP –> AA~tRNA + AMP +PPi

2) PPi +H2O –> 2Pi

17
Q

what is the enzyme that catalyzes the first reaction in the making of activated tRNA?

A

aminoacyl-tRNA synthetase (aaRS)

18
Q

what is the enzyme that catalyzes the second reaction in the making of activated tRNA?

A

pyrophosphatase (PPase)

19
Q

what drives the coupled reaction that creates activated tRNA?

A

the hydrolysis of PPi via PPase which is exergonic.