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

What does homozygous mean?

1. AHaving two identical alleles for a gene
2. BHaving an extra chromosome
3. CHaving only one copy of a gene
4. DHaving two different alleles for a gene

How many millilitres are in one litre?

1. A10
2. B1000
3. C10 000
4. D100

Tế bào nhân sơ, như vi khuẩn, không có gì?

1. ARibosome
2. BMàng tế bào
3. CNhân có màng bao bọc
4. DVật chất di truyền dưới dạng DNA

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 membrane is made mostly of long carbohydrate chains
4. DThe bilayer's core is made of hydrophobic tails

What happens to an enzyme after it has catalysed a reaction?

1. AIt is released unchanged and can be used again
2. BIt is broken down into amino acids
3. CIt changes into the substrate
4. DIt becomes part of the product and leaves with it

Why can DNA profiling (fingerprinting) identify individual people?

1. AEvery person has a different number of chromosomes in their cells
2. BRepeated non-coding DNA regions vary in length between people
3. CDNA in blood differs from DNA in skin
4. DEach person's genes code for different amino acids

The number of bacteria in a sample rises from 200 to 500. What is the percentage increase?

1. A60%
2. B300%
3. C150%
4. D250%

A solution contains 5 mg of a substance in every millilitre. How many milligrams are in 0,02 L of the solution?

1. A1000 mg
2. B10 mg
3. C100 mg
4. D0,1 mg