ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What is cell differentiation?

1. AThe process by which a cell divides into two
2. BThe process by which DNA is copied
3. CThe process by which cells become specialised
4. DThe process by which cells die on purpose

What is an allele?

1. AA protein made from a gene
2. BA different version of the same gene
3. CA section of DNA between genes
4. DA pair of matching chromosomes from each parent

لماذا لا يستطيع الفيروس التكاثر بمفرده؟

1. Aينقسم بالانقسام الاختزالي فقط
2. Bليس لديه أي مادة وراثية، لا DNA ولا RNA
3. Cيتكاثر في ضوء الشمس فقط
4. Dيحتاج إلى جهاز خلية عائلة لصنع النسخ

After gel electrophoresis, which DNA fragments are found furthest from the wells?

1. AThe fragments with the most guanine
2. BThe smallest fragments
3. CThe largest fragments
4. DThe fragments with the most adenine

What do nitrogen-fixing bacteria do?

1. AThey convert nitrogen gas into compounds that plants can use
2. BThey break down proteins into glucose
3. CThey turn carbon dioxide into sugar
4. DThey release nitrogen gas from dead organisms into the air

HIV is a retrovirus. What does its enzyme reverse transcriptase do?

1. AIt breaks down the host's ribosomes
2. BIt makes proteins from the virus's DNA
3. CIt makes RNA from the host's DNA
4. DIt makes DNA from the virus's RNA

Why are modified viruses often used to deliver genes in gene therapy?

1. AViruses are larger than human cells, so they can carry many genes
2. BViruses produce antibodies that fix faulty genes
3. CViruses can reproduce without a host cell
4. DViruses naturally insert their genetic material into host cells

Why do cells get far more ATP from glucose when oxygen is present than when it is absent?

1. AWithout oxygen the Krebs cycle runs faster but makes less ATP
2. BWithout oxygen, glucose cannot enter the cell or be broken down at all
3. CWithout oxygen only glycolysis runs, giving a net of 2 ATP per glucose
4. DOxygen itself is converted into ATP in the mitochondria