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LenKa [72]
3 years ago
14

What vocational area is the FFA built around? List or identify National officers from california and their year of service.

Biology
1 answer:
goblinko [34]3 years ago
4 0

Answer:

1. The National FFA Organization is built around Agricultural education.

2. The National Officers from California from 1928 -2020 are:

  • Arthur Ketterlin 1928-29
  • Lex Murray 1937-38
  • Joseph E. Giacomini 1941-42
  • <em>Robert Bowman President 1943-44</em>
  • Eugene E. Starkey 1945-46
  • Robert L. Smith 1950-51
  • Jerry Diefenderfer 1962-63
  • Joe Martinez 1968-69
  • Dan Dooley 1970-71
  • Peter Giacomini 1974-75
  • Phil Benson 1979-80
  • <em>Jan Eberly President 1982-83</em>
  • Michael Gayaldo 1984-85
  • Louie Brown 1991-92
  • Kevin White Secretary 1992-93
  • Travis D. Hagen Secretary 1994-95
  • James Garner 1998-99
  • Angela Browning 2000-01
  • Dane White President 2001-02
  • Tim Hammerich President 2002-03
  • Beau Williamson President 2006-07
  • Nessie Early Secretary 2008-09
  • Levy Randolph President 2009-10
  • Lindsey Anderson 2012-13
  • Breanna Holbert President 2017-18
  • Luke O’Leary  President 2018-19

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Assuming that ambulances carry blood for purposes of transfusion, the blood type that I would expect to be in greatest supply in an ambulance would be Blood Type O. Blood Type O is dubbed the universal donor (or General donor) because they have there are neither A nor B antigens.

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Describe the probable effects on gene expression in the lac operon of each mutation: a. Mutation in the lac operator that delete
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Answer:

a. Reduces represor binding.

b. Constitutive expression of the operon.

c. Stronger promoter if it is more similar to the consensus sequence. Weaker promoter if less similar.

Explanation:

The lac operon is an operon required for lactose transport and metabolism in enteric bacteria such as <em>Escherichia coli</em>. <u>It is regulated by glucose and lactose availability</u> and consists of the following structural genes:

  • Lac z gene: encodes the enzyme β-galactosidase, which catalyzes the hydrolysis reaction of lactose into glucose and galactose.
  • Gene lac y: encodes the protein galactoside permease involved in the transport of lactose into the bacterium.
  • Lac a gene: encodes the enzyme thiogalactoside transferase, which catalyzes the transfer of the acetyl group of acetyl coenzyme A to 6-OH of a thiogalactoside acceptor. This gene is not related to lactose metabolism.
  • Promoter: region of DNA recognized by RNA polymerase for transcription.
  • Operator: region of DNA located between the promoter and the beginning of the structural genes, which is recognized by the repressor protein Lac I.
  • Repressor gene (lac I): encodes the Lac I repressor protein, which recognizes the operator region, where it binds. It prevents the transcription of genes under the control of this promoter but stimulates the binding of RNA polymerase. When the repressor is absent (in the presence of inducer which in this case will be lactose or IPTG), RNA polymerase will begin transcription.

The lac operon is under a type of negative regulation, where genes can always be transcribed, except when the Lac I repressor protein is bound to the operon region, for which it has a high affinity. In this case, the promoter of the lac I gene is constitutive, so the Lac I protein is permanently expressed and remains bound in tetramer form to the operon region, preventing the transcription of structural genes.

Since lactose is the inducer of the operon, it is able to bind to the Lac I repressor protein and generate a conformational change that decreases its affinity for the operon region. Thus, the operon region is left free, <u>RNA polymerase can freely transcribe the structural genes and β-galactosidase can degrade lactose to glucose plus galactose</u>. <u>In the absence of lactose, the Lac I repressor protein maintains its high affinity for the operator region, preventing RNA polymerase from transcribing the structural genes</u>. In this way, the system remains closed with consequent energy savings for the bacterium.

As a final clarification, actually the true inducing molecule of the lac operon is called allolactose, an isomer of lactose obtained by a transglycosylation occasionally carried out by β-galactosidase.

a. When there is a mutation in the lac operator that deletes most of the operator, then the repressor Lac I can no longer bind and RNA polymerase will begin transcription.

b. When there is a mutation in the Lac I gene that eliminates the binding of repressor to operator, then this protein can not produce the repression so there would be a constitutive expression of the operon.

c. Since the promoter us a region of DNA recognized by RNA polymerase for transcription, if there is a mutation here it will generate a stronger promoter in the case that this part is similar to a consensus sequence (the most commonly encountered nucleotides found at a certain location). In the case that it is less similar, then it will generate a weaker promoter.

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