Phiếu bài tập Sinh học cho kỳ thi đầu vào điều dưỡng có đáp án

What is the main material in the cell wall of bacteria?

1. AChitin
2. BKeratin
3. CPeptidoglycan
4. DCellulose

What does the enzyme DNA ligase do?

1. AIt unwinds the DNA double helix
2. BIt joins pieces of DNA together
3. CIt makes RNA from a DNA template
4. DIt cuts DNA at specific sites

What are the bacteria called that normally live on the skin and in the gut without causing disease?

1. ANormal flora
2. BVectors
3. CPathogens
4. DPrions

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

Khi tập luyện nặng, tế bào cơ thiếu oxygen. Chúng thay vào đó tạo ra gì từ glucose?

1. ARượu và carbon dioxide
2. BAcid lactic (lactate) và một lượng nhỏ ATP
3. CGlycogen và nước
4. DMột lượng lớn ATP và oxygen

How can bacteria pass antibiotic-resistance genes directly to other bacteria?

1. ABy meiosis, forming gametes with new alleles
2. BBy conjugation, transferring plasmids through a pilus
3. CBy mitosis, sharing copies of their chromosomes with neighbours
4. DBy osmosis, moving genes in water

Fresh liver is dropped into hydrogen peroxide and bubbles form quickly. Boiled liver gives no bubbles. What is the best conclusion?

1. ABoiled liver contains more hydrogen peroxide than fresh liver
2. BLiver contains an enzyme that is destroyed by boiling
3. CThe bubbles are carbon dioxide from respiration
4. DHydrogen peroxide is broken down only by heat

A restriction enzyme cuts at three sites in a linear piece of DNA. How many fragments are produced?

1. A3
2. B4
3. C6
4. D2