L02 practice questions

Question 1

What is included in an experiment to try to avoid bias

Answer 1

placebo

Question 2

What will strengthen data to support a conclusion?

Answer 2

• to test more ppl to try to get reproducible data

Question 3

If a placebo group has the same results as the drug treatment group, what does this mean?

Answer 3

supports the conclusion that the drug has no effect on whatever outcome

Question 4

ATI study manual page 254 questions 1-5

Question 5

What would cause chloroplasts to decrease in number from June 30 to September 30?

Answer 5

the amount and intensity of sunlight

Question 6

In the 1990’s, the sea lion and seal populations in western Alaska declined. The killer whales that hunted those populations began eating sea otters instead. Sea otters are predators of sea urchins, which eat brown kelp. What is most likely to result of this situation?
* the population of killer whales increased
* the population of brown kelp declined
* the population of sea urchins decline
* the population of sea otters increased

Answer 6

• B bc more killer whales eating more sea otters, so less sea otters eating sea urchins, so more able to eat brown kelp
• A is WRONG bc a change in food source is going to cause a same or decrease in them NOT an increase in killer whales

Question 7

When there are bubbles and rapid drop in temperature of a solution, what type of change is occuring (reaction type and also exo or endothermic)?

Answer 7

• chemical reaction from bubbles and rapid change in temp
• endothermic bc surrounding temp drops

Question 8

Flavonoids in cranberry juice reduce the incidence of UTI’s, How?

Answer 8

they impede the ability of bacteria to adhere to other cells and cause infections