Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

What does the enzyme DNA ligase do?

1. AIt cuts DNA at specific sites
2. BIt makes RNA from a DNA template
3. CIt unwinds the DNA double helix
4. DIt joins pieces of DNA together

What is the aim of gene therapy?

1. ATo remove all the genes from a patient's cells
2. BTo treat a disease by adding a working copy of a faulty gene
3. CTo change the patient's blood type
4. DTo give a patient antibiotics through a vein to kill a virus

Which protein carries oxygen in red blood cells?

1. AKeratin
2. BCollagen
3. CHaemoglobin
4. DInsulin

When most people in a community are vaccinated, people who cannot be vaccinated are also protected. Why?

1. AThe pathogen has too few hosts to spread easily
2. BThe pathogen mutates into a harmless form
3. CThe vaccine spreads from person to person
4. DVaccinated people make antibodies for others

A patient's heart rate is measured four times: 70, 72, 74 and 80 beats per minute. What is the mean?

1. A74 beats per minute
2. B80 beats per minute
3. C73 beats per minute
4. D72 beats per minute

What does RNA polymerase do?

1. AIt builds an RNA strand from a DNA template
2. BIt builds a protein from an mRNA template
3. CIt removes introns from pre-mRNA
4. DIt copies the whole genome before cell division

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

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

In a family, a trait appears mostly in males. Affected men have daughters who are unaffected, but some of these daughters have affected sons. Which pattern fits best?

1. AAutosomal recessive with equal sexes
2. BAutosomal dominant
3. CX-linked recessive
4. DY-linked