ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

How does a vaccine protect a person?

1. AIt trains the immune system with a harmless form of a pathogen
2. BIt blocks the pathogen from entering the nose
3. CIt kills all bacteria in the body straight away
4. DIt replaces the person's white blood cells with stronger ones

في التجربة، ما المتغير المستقل؟

1. Aالعامل الذي يُقاس بوصفه النتيجة
2. Bالمجموعة التي لا تتلقى معالجة
3. Cالعامل الذي يغيّره الباحث عمدًا
4. Dالعامل الذي يبقى ثابتًا في كل المجموعات

Which kind of organism causes malaria?

1. AA fungus that grows on skin
2. BA bacterium carried in water
3. CA protist carried by mosquitoes
4. DA virus spread by coughing

What does the enzyme lipase break down?

1. AFats into fatty acids and glycerol
2. BStarch into sugars
3. CProteins into amino acids and peptides
4. DDNA into nucleotides

يقرأ خيط DNA القالب T-A-C. ما كودون mRNA المقابل؟

1. AU-T-G
2. BT-A-C
3. CA-U-G
4. DA-T-G

A deletion removes exactly three bases, forming one whole codon, from the middle of a gene. What is the most likely result?

1. ANo protein can be made at all
2. BThe protein lacks one amino acid but the rest is unchanged
3. CEvery amino acid after the deletion is changed to a new one
4. DThe protein becomes three times longer

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

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

Why are mutations in mitochondrial DNA passed on only from mothers to their children?

1. AThe zygote's mitochondria come from the egg
2. BSperm cells contain no DNA at all
3. COnly women have mitochondria in their cells
4. DMitochondrial DNA is on the X chromosome