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

Chất nào sau đây là lipid?

1. AGlycogen, dạng dự trữ của glucose
2. BHemoglobin
3. CTriglyceride (chất béo)
4. DDNA

Which bonds hold the two strands of a DNA double helix together?

1. AHydrogen bonds between the bases
2. BDisulfide bonds between the bases
3. CPeptide bonds between the sugars
4. DIonic bonds between the phosphates

What is the active site of an enzyme?

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

What happens when a ribosome reaches a stop codon on the mRNA?

1. AA special amino acid is added to end the chain
2. BThe ribosome goes back to the start codon
3. CThe mRNA is copied back into DNA
4. DTranslation ends and the protein is released

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

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

Liên kết nào nối các amino acid với nhau trong protein?

1. ALiên kết glycoside
2. BLiên kết ester
3. CLiên kết peptide
4. DLiên kết hydrogen giữa các base

A patient with type A blood is given type B red blood cells by mistake. What is the cause of the reaction that follows?

1. AThe patient's A antigens dissolve the donor's haemoglobin
2. BAnti-A antibodies on the donor cells attack the patient's plasma
3. CThe donor's B antigens destroy the patient's white blood cells
4. DAnti-B antibodies in the patient's plasma attack the donor cells

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

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