ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

What are the three parts of a nucleotide?

1. AAn amino group, a sugar and a fatty acid
2. BA carboxyl group, a base and a lipid
3. CA glycerol, a phosphate and a fatty acid
4. DA phosphate, a sugar and a nitrogen base

In an enzyme reaction, what is the substrate?

1. AThe part of the enzyme that changes shape
2. BThe gene that codes for the enzyme
3. CThe product released at the end
4. DThe substance that the enzyme acts on

أي وحدة تُستخدم غالبًا للتعبير عن حجم الخلية؟

1. Aالأمتار (m)
2. Bاللترات (L)
3. Cالكيلومترات (km)
4. Dالميكرومترات

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

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

A greenhouse is warm and brightly lit, but the air has very little carbon dioxide. What is most likely limiting the rate of photosynthesis?

1. AThe carbon dioxide concentration
2. BThe number of stomata
3. CThe light intensity in the greenhouse
4. DThe temperature

Where does the oxygen released by photosynthesis come from?

1. AFrom water molecules that are split
2. BFrom carbon dioxide molecules that are split
3. CFrom glucose that is broken down
4. DFrom chlorophyll that is used up

أُدخلت قاعدة إضافية واحدة قرب بداية جين. لماذا يكون لذلك عادةً أثر كبير في البروتين؟

1. Aلا أثر له لأن الشفرة فائضة
2. Bيزيح إطار القراءة لجميع الكودونات اللاحقة
3. Cيغيّر حمضًا أمينيًا واحدًا فقط في البروتين
4. Dيحوّل الجين إلى صبغي مختلف

Why is one new DNA strand made in short pieces (Okazaki fragments) during replication?

1. AHelicase cuts that strand into pieces before copying
2. BOnly half of the DNA needs to be copied
3. CDNA polymerase works only 5' to 3', and the strands are antiparallel
4. DThe lagging strand is made of RNA instead of DNA, so it must be built in pieces