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

Quali sono i monomeri degli acidi nucleici come il DNA?

1. ALe molecole di glicerolo
2. BLe molecole di glucosio
3. CI nucleotidi
4. DGli amminoacidi

What is true of a recessive allele?

1. AIts trait shows only when two copies are present
2. BIts trait shows whenever one copy is present
3. CIt is always harmful to the organism
4. DIt is found only on the X chromosome

What are stomata?

1. AGreen structures in the leaf that store starch
2. BTubes that carry water up the stem
3. CHairs on roots that absorb minerals
4. DSmall pores in leaves that allow gas exchange

Why do many plants close their stomata on hot, dry days?

1. ATo take in more carbon dioxide
2. BTo release more oxygen
3. CTo reduce water loss
4. DTo speed up photosynthesis

Which element is found in all amino acids but not in carbohydrates?

1. AOxygen
2. BHydrogen
3. CNitrogen
4. DCarbon

Identical twins raised in different homes have different body weights. What does this show?

1. AThe phenotype depends on environment as well as genotype
2. BThe twins must have different genotypes for body weight genes
3. CBody weight is controlled by a single gene
4. DMutations happened in every cell of one twin

At dawn, a plant shows no overall uptake or release of oxygen or carbon dioxide. What is the best explanation?

1. AIts rate of photosynthesis equals its rate of respiration
2. BIt only respires at dawn
3. CIts stomata are permanently closed at dawn
4. DIt has stopped both photosynthesis and respiration until it is light

One sample of an enzyme is boiled and then cooled to 37 °C. Another is kept at 4 °C and then warmed to 37 °C. Which sample will work at 37 °C?

1. ANeither sample will work
2. BOnly the sample that was kept at 4 °C
3. COnly the sample that was boiled
4. DBoth samples will work equally well