Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

What is the job of the capsule found around some bacteria?

1. AIt protects the cell, for example from white blood cells
2. BIt holds the bacterium's main chromosome
3. CIt is used to swim through liquids
4. DIt helps the bacterium make energy by photosynthesis

What is a mutagen?

1. AAn enzyme that copies DNA
2. BSomething that can cause changes in DNA
3. CA protein that repairs damaged DNA
4. DA cell that divides without control

What does transfer RNA (tRNA) do?

1. AIt carries the code out of the nucleus
2. BIt copies DNA in the nucleus
3. CIt brings amino acids to the ribosome
4. DIt joins two DNA strands together

When plotting the results of an experiment, which variable usually goes on the y-axis?

1. AThe independent variable
2. BThe time the experiment started
3. CThe controlled variable
4. DThe dependent variable

Which body system works with the respiratory system to deliver oxygen to body cells?

1. AThe circulatory system
2. BThe skeletal system
3. CThe urinary system
4. DThe digestive system

In gel electrophoresis, why does DNA move towards the positive electrode?

1. ADNA has a positive charge from the nitrogen bases it contains
2. BDNA has a negative charge from its phosphate groups
3. CDNA is pulled by gravity through the gel
4. DDNA has no charge and moves at random

Kuris pokytis pagreitintų difuziją pro membraną?

1. ADidesnis koncentracijų skirtumas tarp abiejų pusių
2. BMažesnis apsikeitimo paviršiaus plotas
3. CŽemesnė temperatūra abiejose pusėse
4. DStoresnė membrana

Potato cylinders are placed in sugar solutions of different strengths. They gain mass in weak solutions, lose mass in strong ones and show no change at 0,3 mol/L. What can be concluded?

1. APotato cells are always hypertonic to sugar solutions
2. BSugar enters the cells only by active transport, not by diffusion
3. CThe potato cells have a solute concentration of about 0,3 mol/L
4. DThe potato cells contain no water at all