Scheda di esercizi di Biologia per i test di ammissione a infermieristica con soluzioni

Scheda di esercizi di Biologia per i test di ammissione a infermieristica gratuita e stampabile: 8 esercizi dal livello facile a quello d’esame, con le soluzioni. Stampala o salvala come PDF.

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Nome: ____________________   Data: ____________

1.Facile

Which pigment absorbs light energy for photosynthesis?

  1. AMelanin
  2. BKeratin
  3. CChlorophyll
  4. DHaemoglobin
2.Facile

Qual è la struttura principale della membrana cellulare?

  1. AUno strato rigido di fibre di cellulosa e lignina
  2. BUn unico foglio di molecole di amido
  3. CUna spessa parete di peptidoglicano
  4. DUn doppio strato di fosfolipidi con proteine inserite
3.Facile

Which bonds hold the two strands of a DNA double helix together?

  1. APeptide bonds between the sugars
  2. BDisulfide bonds between the bases
  3. CHydrogen bonds between the bases
  4. DIonic bonds between the phosphates
4.Media

Why is DNA replication called semiconservative?

  1. AThe old DNA molecule is kept whole, and a completely new one is made
  2. BEach new DNA molecule has one old strand and one new strand
  3. CEach new strand is a random mix of old and new pieces
  4. DOnly half of the DNA is copied each time
5.Media

What is the difference between an epidemic and a pandemic?

  1. AAn epidemic is caused only by bacteria
  2. BA pandemic affects only one town
  3. CAn epidemic affects the whole world at once
  4. DA pandemic spreads across many countries or continents
6.Media

A deletion removes exactly three bases, forming one whole codon, from the middle of a gene. What is the most likely result?

  1. AThe protein lacks one amino acid but the rest is unchanged
  2. BNo protein can be made at all
  3. CThe protein becomes three times longer
  4. DEvery amino acid after the deletion is changed to a new one
7.Difficile

An old idea says giraffes got long necks because each one stretched to reach leaves and passed the longer neck to its young. Why is this idea rejected?

  1. AGiraffes do not eat leaves from tall trees, so stretching is not needed
  2. BNeck length is not affected by any genes
  3. CChanges acquired in a lifetime are not passed on in the genes
  4. DOnly plants can pass on traits to offspring
8.Difficile

An inhibitor binds to an enzyme away from the active site and changes the enzyme's shape. Adding more substrate does not restore the rate. What type of inhibition is this?

  1. ACompetitive inhibition
  2. BSubstrate saturation
  3. CNoncompetitive inhibition
  4. DDenaturation by heat

Soluzioni

  1. 1. C · Chlorophyll
  2. 2. D · Un doppio strato di fosfolipidi con proteine inserite
  3. 3. C · Hydrogen bonds between the bases
  4. 4. B · Each new DNA molecule has one old strand and one new strand
  5. 5. D · A pandemic spreads across many countries or continents
  6. 6. A · The protein lacks one amino acid but the rest is unchanged
  7. 7. C · Changes acquired in a lifetime are not passed on in the genes
  8. 8. C · Noncompetitive inhibition

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