Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

What is a decomposer?

1. AAn animal that eats only plants
2. BAn animal that hunts other animals
3. CAn organism that makes food from sunlight
4. DAn organism that breaks down dead material

In an enzyme reaction, what is the substrate?

1. AThe gene that codes for the enzyme
2. BThe substance that the enzyme acts on
3. CThe product released at the end
4. DThe part of the enzyme that changes shape

What is activation energy?

1. AThe energy stored in a molecule of ATP
2. BThe heat released when a reaction finishes
3. CThe energy plants take in from sunlight
4. DThe energy needed to start a chemical reaction

Why do chromosomes condense into short, thick shapes before mitosis?

1. ASo that genes can be transcribed more easily
2. BSo they can be moved apart without tangling or breaking
3. CSo that they can be copied more quickly
4. DSo that they can leave through the nuclear pores

What is the job of the checkpoints in the cell cycle?

1. ATo stop the cycle if the DNA is damaged or the cell is not ready
2. BTo speed up division whenever the cell is short of nutrients or space
3. CTo copy the DNA a second time before mitosis
4. DTo join the two daughter cells back together

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

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

Scientists put a human gene into bacteria to make a protein. Why do they use a DNA copy made from the mature mRNA instead of the gene taken straight from human DNA?

1. ABacteria cannot read human codons
2. BBacteria have no ribosomes
3. CHuman DNA has no start codons
4. DBacteria cannot remove introns

During the Industrial Revolution, soot darkened tree trunks in parts of England, and dark peppered moths became more common than pale ones. What best explains this?

1. AThe soot settled on the pale moths and slowly turned them dark
2. BThe moths chose to become dark to hide
3. CBirds found and ate fewer dark moths on the dark trunks
4. DDark moths were produced by the polluted air