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

What is an allele?

1. AA section of DNA between genes
2. BA protein made from a gene
3. CA different version of the same gene
4. DA pair of matching chromosomes from each parent

What is an inference?

1. AA variable that the scientist changes on purpose
2. BA conclusion reached from observations and prior knowledge
3. CA measurement taken with a calibrated instrument in a laboratory
4. DA list of the materials used in an experiment

Phân tử DNA có hình dạng gì?

1. AMột vòng phẳng
2. BChuỗi xoắn kép
3. CChuỗi xoắn ba
4. DMột sợi đơn thẳng

Why must human gametes be haploid?

1. ASo that the gametes can divide quickly by mitosis
2. BSo that the zygote has twice the normal number of chromosomes
3. CSo that the gametes can make more proteins
4. DSo that the zygote has the normal number of 46 chromosomes

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

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

What is meant by independent assortment in meiosis?

1. ASister chromatids stay joined until the end of meiosis, so all gametes are identical
2. BAll chromosomes from the mother go into the same gamete
3. CDNA is copied separately in each chromosome
4. DHomologous pairs line up randomly, so gametes get different mixes of chromosomes

At 100× total magnification, the field of view of a microscope is 2 mm wide. What is its width at 400×?

1. A0,5 mm
2. B0,2 mm
3. C2 mm
4. D8 mm

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. ADenaturation by heat
2. BNoncompetitive inhibition
3. CCompetitive inhibition
4. DSubstrate saturation