Cevaplı Hemşirelik giriş sınavları için biyoloji çalışma kâğıdı

Bir deneyde bağımlı değişken nedir?

1. AAraştırmacının bilerek değiştirdiği etken
2. BSabit tutulan herhangi bir etken
3. CSınanan hipotez
4. DEtkiyi görmek için ölçülen etken

What does the polymerase chain reaction (PCR) do?

1. AIt turns RNA into protein
2. BIt separates proteins by their charge
3. CIt cuts DNA at specific sequences
4. DIt makes many copies of a piece of DNA

Which gas do plants take in from the air for photosynthesis?

1. ANitrogen
2. BCarbon dioxide
3. COxygen
4. DHydrogen

Why does ice float on liquid water?

1. AIce molecules are lighter than liquid water molecules
2. BIce is denser than liquid water
3. CIce contains more air than liquid water
4. DHydrogen bonds hold ice in an open, less dense structure

To insert a human gene into a bacterial plasmid, scientists cut both the gene and the plasmid with the same restriction enzyme. Why?

1. ASo both pieces become exactly the same length
2. BSo the gene is turned into RNA
3. CSo the plasmid loses all its genes
4. DSo the cut ends match and can join together

How can bacteria pass antibiotic-resistance genes directly to other bacteria?

1. ABy mitosis, sharing copies of their chromosomes with neighbours
2. BBy meiosis, forming gametes with new alleles
3. CBy conjugation, transferring plasmids through a pilus
4. DBy osmosis, moving genes in water

A study finds that coffee drinkers have more lung cancer. Later it is found that coffee drinkers in the study also smoked more. What is smoking in this study?

1. AA placebo
2. BThe control group
3. CThe dependent variable
4. DA confounding variable

Finches on the Galápagos Islands have different beak shapes on islands with different foods. What is the best explanation?

1. AEach bird changed its beak by using it more
2. BThe beaks changed because the birds chose to eat new food
3. CNatural selection favoured beaks suited to each food source
4. DThe birds were all created with the same beak and it never changed