Робочий аркуш «Біологія для вступних іспитів на медсестринство» з відповідями

Які чотири основи входять до складу ДНК?

1. AАланін, тимін, гліцин і цистеїн
2. BАденін, тимін, гуанін і цитозин
3. CАденін, урацил, гуанін і цитозин
4. DАденін, тимін, глюкоза і цитозин

What are the parts of a triglyceride (a fat molecule)?

1. AOne glycerol and three fatty acids
2. BOne amino acid and three fatty acids
3. CTwo glycerols and one fatty acid
4. DThree glucose units and one phosphate

Which enzyme unwinds the DNA double helix and separates the two strands for copying?

1. AAmylase
2. BLipase
3. CHelicase
4. DLigase

A solution of pH 4 is compared with a solution of pH 6. How many times more hydrogen ions does the pH 4 solution have?

1. A2 times
2. B10 times
3. C20 times
4. D100 times

Why is DNA replication called semiconservative?

1. AOnly half of the DNA is copied each time
2. BEach new strand is a random mix of old and new pieces
3. CEach new DNA molecule has one old strand and one new strand
4. DThe old DNA molecule is kept whole, and a completely new one is made

What is a bacterial endospore?

1. AA small ring of DNA that carries antibiotic resistance genes
2. BA reproductive cell that bacteria use to make new colonies quickly
3. CA hair-like structure used to swim towards food
4. DA tough, dormant form that survives heat, drying and many disinfectants

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. B2 mm
3. C0,2 mm
4. D8 mm

Which statement correctly compares DNA replication and transcription?

1. AReplication makes RNA from DNA; transcription makes DNA from RNA
2. BBoth take place on ribosomes in the cytoplasm
3. CReplication copies all the DNA; transcription copies one gene
4. DBoth use thymine and deoxyribose in the new strand