Biologia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

In science, what is an observation?

1. AA rule that explains all known facts
2. BInformation gathered with the senses or instruments
3. CA guess about why something happens
4. DA conclusion drawn before any data are collected

What does the polymerase chain reaction (PCR) do?

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

In an enzyme reaction, what is the substrate?

1. AThe product released at the end
2. BThe gene that codes for the enzyme
3. CThe substance that the enzyme acts on
4. DThe part of the enzyme that changes shape

The results of an experiment do not support the hypothesis. What should the scientist do next?

1. AStop doing any further research on the question
2. BChange the data so they fit the hypothesis
3. CReport that the hypothesis was proven correct
4. DRevise the hypothesis and test it again

Which process removes carbon dioxide from the atmosphere?

1. APhotosynthesis
2. BCellular respiration
3. CDecomposition
4. DBurning fossil fuels

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

1. ASalt blocks sunlight from reaching the leaves
2. BThe roots take in too much water
3. CWater leaves the root cells by osmosis
4. DSalt makes the root cells swell and burst

A survey finds that students who sleep more get higher test scores. Which study would best test whether more sleep causes better scores?

1. ACompare the test scores of students at two different schools
2. BRandomly assign students to different sleep times and compare their scores
3. CSurvey a much larger group of students about their sleep habits
4. DAsk the students with the highest scores how they study

A human body cell has 46 chromosomes in G1. How many chromatids does it have at metaphase of mitosis?

1. A46
2. B92
3. C23
4. D184