Chapter 1 Praxis 5442
What is the density of a solid that has a mass of 9.2 grams and a volume of 12.3 cm3? Would this object float or sink in the water?
0.75 g/cm3, float
From the following data, what is the mode, mean, and median? 1, 3, 5, 5, 6, 6, 7, 9, 10, 10, 10
10, 6, 6.5
How many mL are in a 3.4 L?
3,400 mL
Simge's guinea pig weighs exactly 560. grams. Which of the following most accurately expresses the weight of Simge's guinea pig in scientific notation?
5.60 x 10^2
Why are standard units important in the biology lab?
All answers are correct
Which piece of safety equipment is typically optional in a lab? Fire extinguisher Eye wash station First aid kit Emergency shower All should be standard pieces of equipment in any lab
All should be standard pieces of equipment in any lab
If you are dissecting a specimen, which would you be LEAST likely to use to help you?
Bunsen burner
Which of the following is NOT a true solution to deal with the problem of human analysis being unreliable?
Check with people and make sure they haven't made any errors
A scientist is running a test of her hypothesis. Which step of the scientific method is she executing?
Experiment
A researcher performed a study in which she concluded that children who have parents who read to them at home have better reading skills at school. However, she only included children in the top reading level at school, and no children who have trouble reading. Because she only included one group, and not all groups of children, her study probably has a low level of _______.
External validity
A single assertion, a proposed explanation of something based on available knowledge, for something yet to be explained, one that is subject to further experimentation is called:
Hypothesis
When dispensing a drug, which of the following may need to be noted? I. The amount dispensed II. Who dispensed it III. The name of the drug dispensed
I, II, III
What's the best way to store light-sensitive substances?
In a dark container, such as a dark brown/tinted beaker made of thick glass, that's stored in a dark room
A research study where the cause-effect conclusions are accurate, and there are no other possible explanations for the result has a high level of ______ validity.
Internal
How should you dispose of substances in the lab?
It depends on the specific instructions for each substance
What is the standard unit of mass?
Kilogram
Which of the following is one advantage of putting liquid on a specimen, as used in wet mount slides?
Magnification of the specimen
What is statistical estimation?
Methods for reducing errors in inferential statistics
Which of the following is the number that appears most often?
Mode
Which of the following is a way that scientists check each other's work and look for weaknesses?
Peer review
Which of these is a process that requires scientists to critique each other's work and decide whether it meets the standards of the scientific community?
Peer review
The systematic investigation of scientific theories and hypotheses is known as:
Scientific research
What should you do with substances that are heating?
Stay with them at all times
Dr. Patel does an experiment in which she shows people either a happy movie, a sad movie, or no movie in a classroom. Then, she asks them to fill out a survey assessing their feelings about whether they want to adopt a pet from the animal shelter. In this experiment, what was the control group?
The people who watched no movie
Dr. Patel does an experiment in which she shows people either a happy movie, a sad movie, or no movie in a classroom. Then, she asks them to fill out a survey assessing their feelings about whether they want to adopt a pet from the animal shelter. In this experiment, what was the INDEPENDENT variable?
The type of movie viewed
What is the purpose of a ventilation hood?
To contain gases, fumes, and vapors
What is the main goal of the scientific method?
To help humans collect and analyze data in a consistent, unbiased way
