Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

What does phloem carry in a plant?

1. ACarbon dioxide from the air
2. BWater from the roots only
3. CSugars made in the leaves
4. DChlorophyll to the stem

Which enzyme adds new nucleotides to build a new DNA strand?

1. ARNA polymerase
2. BPepsin
3. CHelicase
4. DDNA polymerase

What are the bacteria called that normally live on the skin and in the gut without causing disease?

1. AVectors
2. BPrions
3. CPathogens
4. DNormal flora

There are 64 possible codons but only about 20 amino acids. What does this tell you about the genetic code?

1. AMost amino acids are coded for by more than one codon
2. BOnly 20 of the codons are ever used
3. CEach amino acid has exactly three codons
4. DEach codon codes for more than one amino acid at the same time

In a food chain, which organisms are the producers?

1. APlants and algae that make food by photosynthesis
2. BPredators at the top of the chain
3. CAnimals that eat only plants, such as rabbits and deer
4. DFungi that break down dead material

Why do red blood cells have a flattened, biconcave disc shape?

1. AIt gives a large surface area for gas exchange
2. BIt lets them hold a larger nucleus and more DNA
3. CIt makes them stick to vessel walls
4. DIt helps them divide faster

In uncontrolled diabetes, glucose appears in the urine and the person passes large volumes of urine. What is the best explanation?

1. AGlucose is broken down into water in the bladder
2. BGlucose makes the kidneys absorb more water
3. CGlucose in the kidney filtrate holds water by osmosis
4. DInsulin makes the kidneys filter more blood

Cells lining the small intestine have tiny finger-like folds of membrane called microvilli. What does this tell you about their job?

1. AThey protect the gut from bacteria by producing mucus
2. BThey move food along by beating like cilia
3. CThey make digestive enzymes in large amounts
4. DThey absorb substances, so they need a large surface area