ورقة عمل الأحياء لامتحانات القبول في التمريض مع الإجابات

ما الذي تفتقر إليه الخلايا بدائية النواة، كالبكتيريا؟

1. Aنواة محاطة بغشاء
2. Bالريبوسومات
3. Cغشاء خلوي
4. Dمادة وراثية على شكل DNA

What is a karyotype?

1. AA list of all the proteins that a cell makes during its life
2. BA map of the organelles inside a cell
3. CA diagram of a family's inheritance pattern
4. DA picture of a cell's chromosomes arranged in pairs by size

أي مما يلي فطر؟

1. Aالإشريكية القولونية (Escherichia coli)
2. Bفيروس الإنفلونزا
3. Cالخميرة
4. Dالأميبا

Red-green colour blindness is X-linked recessive. A colour-blind woman (XᵇXᵇ) has children with a man with normal colour vision (XᴮY). What fraction of their sons is expected to be colour-blind?

1. AAll
2. BOne quarter
3. CNone
4. DOne half

What are introns?

1. AShort pieces of DNA made on the lagging strand
2. BCoding sections joined together to form the mature mRNA
3. CNon-coding sections removed from pre-mRNA before translation
4. DCodons that tell the ribosome to stop translation

A person catches chickenpox once and does not usually become ill with it again. Why?

1. AMemory cells give a faster, stronger response the next time
2. BThe virus stays in the blood and kills new viruses
3. CThe skin becomes thicker after the first infection
4. DAntibodies from the first infection turn into new viruses

Scientists put a human gene into bacteria to make a protein. Why do they use a DNA copy made from the mature mRNA instead of the gene taken straight from human DNA?

1. ABacteria cannot read human codons
2. BBacteria cannot remove introns
3. CBacteria have no ribosomes
4. DHuman DNA has no start codons

يشرب متطوعون 0 أو 100 أو 200 mg من الكافيين، ثم يُقاس معدل ضربات قلبهم بعد 30 دقيقة. ما المتغير التابع؟

1. Aمعدل ضربات القلب بعد 30 دقيقة
2. Bالمتطوعون أنفسهم
3. Cزمن الانتظار البالغ 30 دقيقة
4. Dجرعة الكافيين