Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

Kokiose struktūrose iš aminorūgščių sudaromi baltymai?

1. ACentriolėse
2. BRibosomose
3. CLizosomose
4. DVakuolėse

In science, what is an observation?

1. AInformation gathered with the senses or instruments
2. BA rule that explains all known facts
3. CA conclusion drawn before any data are collected
4. DA guess about why something happens

What is the main role of the cytoskeleton?

1. AIt joins amino acids into proteins
2. BIt controls which substances enter the cell
3. CIt gives the cell its shape and helps it move
4. DIt stores the genetic code of the cell

During childbirth, pressure on the cervix causes oxytocin release, which causes stronger contractions and more pressure. What kind of control is this?

1. AHomeostatic balance
2. BPositive feedback
3. CNegative feedback
4. DNatural selection

To insert a human gene into a bacterial plasmid, scientists cut both the gene and the plasmid with the same restriction enzyme. Why?

1. ASo both pieces become exactly the same length
2. BSo the plasmid loses all its genes
3. CSo the cut ends match and can join together
4. DSo the gene is turned into RNA

Sickle cell disease is caused by a single base change that replaces one amino acid in haemoglobin. What type of mutation is this?

1. AA frameshift mutation
2. BA missense mutation
3. CA silent mutation
4. DA nonsense mutation

A leaf with green and white areas is kept in light and then tested with iodine. Only the green areas turn blue-black. What does this show?

1. AIodine destroys chlorophyll in the leaf
2. BWhite areas store more starch than green areas
3. CLight is not needed for photosynthesis
4. DChlorophyll is needed for photosynthesis

A diploid cell contains 10 units of DNA in G1. How many units are in each cell at the end of meiosis II?

1. A20 units
2. B5 units
3. C10 units
4. D2,5 units