ใบงาน ชีววิทยาสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is the pH of pure water at 25 °C?

1. A14
2. B0
3. C7
4. D1

What is homeostasis?

1. ABreaking down food for energy
2. BChanging a species over many generations
3. CMaking identical copies of a cell
4. DKeeping a stable internal environment

What is the active site of an enzyme?

1. AThe part of the cell where the enzyme is made
2. BThe product formed by the reaction
3. CThe gene that codes for the enzyme
4. DThe region where the substrate binds

การกลายพันธุ์คืออะไร

1. Aการจับคู่ของโครโมโซมคู่เหมือน
2. Bการเปลี่ยนแปลงลำดับเบสของดีเอ็นเอ
3. Cการคัดลอกดีเอ็นเอตามปกติก่อนการแบ่งเซลล์
4. Dการเปลี่ยนแปลงจำนวนเซลล์ในเนื้อเยื่อ

How does facilitated diffusion differ from active transport?

1. AIt moves only water and no other substances
2. BIt works without any membrane proteins
3. CIt needs ATP and moves substances against their gradient
4. DIt needs no energy and moves substances down their gradient

Why can small nonpolar molecules cross the cell membrane easily while ions cannot?

1. AIons are larger than most membrane proteins
2. BThe membrane carries a strong positive charge
3. CThe bilayer's core is made of hydrophobic tails
4. DThe membrane is made mostly of long carbohydrate chains

Parts of a protein chain coil into alpha helices and fold into beta sheets, held by hydrogen bonds. Which level of protein structure is this?

1. ATertiary structure
2. BSecondary structure
3. CQuaternary structure
4. DPrimary structure

An inhibitor binds to an enzyme away from the active site and changes the enzyme's shape. Adding more substrate does not restore the rate. What type of inhibition is this?

1. ACompetitive inhibition
2. BDenaturation by heat
3. CSubstrate saturation
4. DNoncompetitive inhibition