Biology for nursing entrance exams worksheet with answers

Which molecules, made by immune cells, bind to specific antigens?

1. AAntibodies
2. BHormones
3. CPhospholipids
4. DEnzymes

In an enzyme reaction, what is the substrate?

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

Which enzyme adds new nucleotides to build a new DNA strand?

1. APepsin
2. BHelicase
3. CRNA polymerase
4. DDNA polymerase

A student switches a light microscope from low power to high power. What happens to the field of view?

1. AIt gets smaller and usually darker
2. BIt gets larger and brighter
3. CIt stays the same size but gets brighter
4. DIt gets larger but less detailed

There are 64 possible codons but only about 20 amino acids. What does this tell you about the genetic code?

1. AEach codon codes for more than one amino acid at the same time
2. BMost amino acids are coded for by more than one codon
3. CEach amino acid has exactly three codons
4. DOnly 20 of the codons are ever used

Two heterozygous parents (Aa × Aa) are crossed. What is the expected genotype ratio?

1. A1 AA : 1 aa
2. B1 AA : 2 Aa : 1 aa
3. C2 AA : 1 Aa : 1 aa
4. D3 AA : 1 aa

Mature human red blood cells have no nucleus and no mitochondria. What follows from this?

1. AThey keep making new haemoglobin throughout their life
2. BThey cannot divide and make their ATP by glycolysis only
3. CThey live longer than almost all other body cells
4. DThey make ATP by aerobic respiration using the oxygen they carry

A student puts a fertilised plant in a sunny window and an unfertilised plant in a dark cupboard. The fertilised plant grows more. What is the main flaw?

1. AThe student used too much fertiliser on the plant in the window
2. BThere was no hypothesis to test
3. CTwo variables were changed, so the cause is unclear
4. DThe dependent variable was not measured