ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

في التجربة، ما المتغير المستقل؟

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

What is an allele?

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

How does a vaccine protect a person?

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

Which statement about identical and non-identical twins is correct?

1. ANon-identical twins come from one zygote that splits in two
2. BBoth kinds of twin always share all of their genes
3. CIdentical twins come from one zygote; non-identical twins come from two
4. DIdentical twins come from two eggs that are fertilised by a single sperm

Many vitamins act as coenzymes. What does this mean?

1. AThey are built into the cell membrane
2. BThey replace enzymes that have been denatured
3. CThey help enzymes carry out their reactions
4. DThey are digested to release large amounts of energy

وُضعت خلية دم حمراء في محلول شديد الملوحة (مفرط التوتر). ماذا يحدث؟

1. Aيدخل الماء إلى الخلية فتنفجر
2. Bيدخل الملح إلى الخلية فتنتفخ
3. Cلا يتغير شيء لأن الملح لا يستطيع العبور
4. Dيخرج الماء من الخلية فتنكمش

Bacteria grown in heavy nitrogen (¹⁵N) are moved to normal nitrogen (¹⁴N) and allowed to divide once. All their DNA now has a density halfway between heavy and light. Which model of replication does this support?

1. AReplication without a template
2. BSemiconservative replication
3. CConservative replication
4. DReplication by RNA copying

The wings of a bat and the wings of a butterfly are used for flying but have very different structures. What are they called, and what does this show?

1. AVestigial structures, which no longer have a function
2. BHomologous structures, which were inherited from a shared ancestor
3. CHomologous structures, which have the same bones inside
4. DAnalogous structures, which evolved separately for the same job