ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What is endocytosis?

1. AReleasing material from the cell by fusing vesicles with the membrane
2. BSplitting the cytoplasm after the nucleus divides
3. CMoving water across the membrane by osmosis
4. DTaking material into the cell by folding the membrane around it

What is a mutagen?

1. ASomething that can cause changes in DNA
2. BA protein that repairs damaged DNA
3. CAn enzyme that copies DNA
4. DA cell that divides without control

What does homozygous mean?

1. AHaving two identical alleles for a gene
2. BHaving only one copy of a gene
3. CHaving an extra chromosome
4. DHaving two different alleles for a gene

Which of these is part of the body's innate (non-specific) defence?

1. AAntibodies made after vaccination
2. BT cells that recognise one virus
3. CMemory B cells from an earlier infection
4. DThe skin and stomach acid

A person catches chickenpox once and does not usually become ill with it again. Why?

1. AThe virus stays in the blood and kills new viruses
2. BAntibodies from the first infection turn into new viruses
3. CMemory cells give a faster, stronger response the next time
4. DThe skin becomes thicker after the first infection

Why can DNA profiling (fingerprinting) identify individual people?

1. ARepeated non-coding DNA regions vary in length between people
2. BEvery person has a different number of chromosomes in their cells
3. CEach person's genes code for different amino acids
4. DDNA in blood differs from DNA in skin

One sample of an enzyme is boiled and then cooled to 37 °C. Another is kept at 4 °C and then warmed to 37 °C. Which sample will work at 37 °C?

1. AOnly the sample that was kept at 4 °C
2. BBoth samples will work equally well
3. COnly the sample that was boiled
4. DNeither sample will work

Plasmids with an ampicillin-resistance gene are mixed with bacteria, which are then spread on a plate containing ampicillin. Why do only a few colonies grow?

1. AAll the bacteria die, and the colonies are fungi
2. BAmpicillin makes some bacteria take up the plasmid
3. COnly the bacteria that took up the plasmid can survive
4. DThe plasmid kills the bacteria that do not grow