ADVH BIO 3.1&3.2

Which of the following are null hypotheses?

1. Blackbirds show no food preference based on colour.

2. As people age, they do not respond to certain painkillers.

3. As concentration of inhibitor increases, enzyme activity decreases.

4. Increasing light intensity will not affect the rate of germination of cress seeds.

• 1 and 4 only

• 2 and 3 only

• 2 and 4 only

• 1, 2 and 3 only

Four students carried out an experiment to measure the glucose concentration of a carton of fruit juice. Each student measured the values four times.

The table shows the readings obtained.The actual concentration of glucose in the fruit juice was 12 mg/100 ml. Which statement best describes the data set?

• Accurate, but not precise

• Precise, but not add

• Accurate and precise

• Neither accurate or precise

A student used a colorimetric assay to measure the activity of an enzyme in bananas. An extract was prepared from one banana and used five times to measure the enzyme activity. Three absorbance readings were taken for each of the five assays.

The data collected are shown in the table.The student evaluated the data to be reliable and accurate. The student’s evaluation of the data is

• correct because the data are reliable and accurate

• incorrect because the data are accurate but not reliable

• incorrect because the data are reliable but not necessarily accurate

• incorrect because the data are not reliable and not necessarily accurate.

Biological fieldwork often requires the estimation of population size for a prey species. One method used is mark and recapture. If the method of marking reduced the camouflage coloration of this species, what effect would this be likely to have on the population estimate obtained?

• Recapture numbers would be increased and population size would be overestimated

• Recapture numbers would be increased and population size would be underestimated

• Recapture numbers would be decreased and population size would be overestimated

• Recapture numbers would be decreased and population size would be underestimated

Which of the following describes the purpose of a randomised block design?

• Controlling for confounding variables

• Ranking sample data

• Ensuring that sampling is representative

• Monitoring the dependent variable

Which of the following generalisations about skylark

singing behaviour is valid?

• No song decreases the number of attacks by merlins and the time they will chase.

• No song increases the success of attacks by merlins and the time they will chase.

• No song increases the number of attacks by merlins and the time they will chase.

• No song decreases the success of attacks by merlins and the time they will chase.

An in vivo study involves observations made in

• the natural habitat of an animal

• a living cell culture in the laboratory

• a living organism

• extracts prepared from living tissues.

State the purpose of injecting cells with buffer solution only.