Chapter 18 Flashcards Preview

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Flashcards in Chapter 18 Deck (22)
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1
Q

What are the three regulatory processes that appear in operons?

A
  • Repressible operons
  • Inducible operons
  • Glucose repression
2
Q

Why are repressible operons and inducible operons negative feedback?

A

Active forms turn operon off

3
Q

Which type of operon is anabolic and which is catabolic? Why?

A
  • Repressible = anabolic because endergonic (synthesis)

- Inducible = catabolic because exergonic (break down)

4
Q

When does glucose repression occur and on which operon?

A

Lac operon when glucose level is high (meaning cAMP level is high) and lactose level is high; lactose is broken down into food

5
Q

What are the 2 ways bacteria can regulate metabolism?

A
  • Feedback inhibition

- Gene regulation

6
Q

In bacteria, why are parts of gene condensed into operons?

A

To not waste parts and conserve energy

7
Q

Differential gene expression

A

Expression of different genes by cells with same genome

8
Q

What are the histone modification and which are the DNA modifications?

A

Histone: acetylation (loosens histone’s grip on DNA)
DNA: methylation (tightens structure), phosphorylation (loosens methylated structure)

9
Q

Which chromatin remodeling function is best for long-term gene inactivation?

A

DNA methylation

10
Q

What happens in histone actylation?

A

Acetyl is added to lysine on histone tails to loosen its grip on DNA

11
Q

What is genomic printing and what helps it occur?

A

Picking of maternal/paternal allele; DNA methylation

12
Q

What is epigenetic inheritance?

A

That things other than nucleotide sequence can be passed down as a trait

13
Q

What are the 2 types of control elements?

A

Proxal and distal

14
Q

What are the 2 specific transcription factors?

A

Activators and repressors

15
Q

In post-translational modification, what processes help to activate polypeptide chain into protein?

A
  • Cleavage

- Addition of chemical groups

16
Q

What does a ubiquitin protein call over to the tagged protein?

A

Proteasome

17
Q

At which 2 points can noncoding RNAs regulate gene expression?

A
  • mRNA translation

- Chromatin structure

18
Q

What 3 processes help in zygote’s development into adult?

A
  • Cell divison
  • Cell differentiation
  • Morphogenesis
19
Q

What 2 info sources tell cell early in embryonic development which cells to turn off/on?

A
  • Cytoplasmic determinants from egg cell

- Induction signals from neighboring cells

20
Q

Determination?

A

Process that fixes cells fate

21
Q

Pattern formation?

A

Development of organization of cell fates

22
Q

What does cell differentiation always involve?

A

Production of tissue-specific proteins