ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

Which codon signals the start of translation in most genes?

1. AAUG
2. BUAG
3. CUAA
4. DUGA

What is cell differentiation?

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

How does a vaccine protect a person?

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

Many vitamins act as coenzymes. What does this mean?

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

بِمَ يختلف الانتشار المُيسَّر عن الانتشار البسيط؟

1. Aيستخدم بروتينات قنوية أو ناقلة لكن دون ATP
2. Bيستخدم ATP لنقل الجزيئات صعودًا
3. Cينقل الجزيئات عكس تدرجها بمضخة وATP
4. Dلا ينقل سوى الغازات مثل الأكسجين

Why are G–C base pairs held together more strongly than A–T pairs?

1. AG–C pairs form three hydrogen bonds, and A–T pairs form two
2. BA–T pairs are found only in RNA
3. CG and C are both purines, so they fit more tightly
4. DG–C pairs are joined by strong covalent bonds instead of hydrogen bonds

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. AHomologous structures, which were inherited from a shared ancestor
2. BHomologous structures, which have the same bones inside
3. CAnalogous structures, which evolved separately for the same job
4. DVestigial structures, which no longer have a function

A plant that is AaBb is crossed with an AaBB plant. A and B are dominant, and the genes assort independently. What fraction of the offspring show both dominant traits?

1. A1/4
2. B3/4
3. C1/2
4. D9/16