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

Nel metodo scientifico, che cos'è un'ipotesi?

1. AUna spiegazione o previsione verificabile
2. BUna spiegazione ampia sostenuta da molti esperimenti
3. CUn elenco delle misure effettuate
4. DUna conclusione che è stata dimostrata vera

What do receptor proteins in the cell membrane do?

1. AThey store the cell's genetic code for making proteins
2. BThey make ATP for the cell
3. CThey digest bacteria that enter the cell
4. DThey bind specific signal molecules, such as hormones

Which element is found in all organic molecules?

1. APhosphorus
2. BNitrogen
3. CSulfur
4. DCarbon

After gel electrophoresis, which DNA fragments are found furthest from the wells?

1. AThe smallest fragments
2. BThe fragments with the most guanine
3. CThe fragments with the most adenine
4. DThe largest fragments

Why do root hair cells have long, thin extensions?

1. ATo increase the surface area for absorbing water
2. BTo carry out photosynthesis underground
3. CTo store starch for the winter
4. DTo anchor the plant firmly against strong winds and rain

Why do plants wilt when the soil around their roots becomes very salty?

1. AThe roots take in too much water
2. BWater leaves the root cells by osmosis
3. CSalt makes the root cells swell and burst
4. DSalt blocks sunlight from reaching the leaves

Bacteria grown in heavy nitrogen (¹⁵N) are moved to normal nitrogen (¹⁴N) and allowed to divide once. All their DNA now has a density halfway between heavy and light. Which model of replication does this support?

1. AConservative replication
2. BSemiconservative replication
3. CReplication without a template
4. DReplication by RNA copying

Liver cells take in cholesterol-carrying LDL particles only after the particles bind to specific proteins on the cell surface. Which process is this?

1. AReceptor-mediated endocytosis
2. BExocytosis
3. CSimple diffusion
4. DPinocytosis of extracellular fluid