Biology for nursing entrance exams worksheet with answers

Which sugar is found in DNA?

1. AGlucose
2. BFructose
3. CRibose
4. DDeoxyribose

What is a mutagen?

1. ASomething that can cause changes in DNA
2. BA protein that repairs damaged DNA
3. CAn enzyme that copies DNA
4. DA cell that divides without control

Who first worked out the basic rules of inheritance by breeding pea plants?

1. AGregor Mendel
2. BLouis Pasteur
3. CCharles Darwin
4. DRobert Hooke

Which sequence is complementary to the DNA strand A-T-G-C-C-A?

1. AT-A-C-G-G-T
2. BG-C-A-T-T-G
3. CU-A-C-G-G-U
4. DA-T-G-C-C-A

Why do plants wilt when the soil around their roots becomes very salty?

1. AThe roots take in too much water
2. BSalt makes the root cells swell and burst
3. CSalt blocks sunlight from reaching the leaves
4. DWater leaves the root cells by osmosis

Where does the oxygen released by photosynthesis come from?

1. AFrom water molecules that are split
2. BFrom glucose that is broken down
3. CFrom chlorophyll that is used up
4. DFrom carbon dioxide molecules that are split

Plasmids with an ampicillin-resistance gene are mixed with bacteria, which are then spread on a plate containing ampicillin. Why do only a few colonies grow?

1. AAmpicillin makes some bacteria take up the plasmid
2. BAll the bacteria die, and the colonies are fungi
3. CThe plasmid kills the bacteria that do not grow
4. DOnly the bacteria that took up the plasmid can survive

A man with an X-linked recessive disorder (XʰY) has children with a woman who has two normal alleles (XᴴXᴴ). What is expected among their children?

1. AAll sons are affected, and no daughters are carriers
2. BAll daughters are carriers, and no sons are affected
3. CHalf of the sons and half of the daughters are affected
4. DAll daughters are affected, and all sons are carriers