Q: A student measures the mass of an empty beaker as 50 g and the mass of the beaker with water as 90 g. What is the mass of the water?

$$90 \text{ g} - 50 \text{ g} = 40 \text{ g}$$

Question 1

Which of the following best describes the main advantage of the metric system over the English system for scientific measurements?

Accepted Answer

It uses a decimal (base 10) system, making calculations and conversions simpler.

Question 2

A scientist is testing a new medication. She gives one group the medication, another group a placebo, and a third group a drug already known to work. What is the role of the group receiving the known drug?

Accepted Answer

They serve as the positive control.

Question 3

Which of the following is the correct conversion for 1.2 meters to centimeters?

Accepted Answer

$$1.2 	imes 100 = 120 cm$$

Question 4

A student measures the mass of an empty beaker as 50 g and the mass of the beaker with water as 90 g. What is the mass of the water?

Accepted Answer

$$90 	ext{ g} - 50 	ext{ g} = 40 	ext{ g}$$

Question 5

Which of the following is the correct way to read the volume of a liquid in a graduated cylinder?

Accepted Answer

At the lowest point of the meniscus, with your eye level with the meniscus

Question 6

A hypothesis states that the upper limb length is 40% of a person's height. If a student is 170 cm tall, what is the expected upper limb length according to the hypothesis?

Accepted Answer

$$170 	imes 0.4 = 68 cm$$

Question 7

Which of the following is NOT a function of the human skeletal system?

Accepted Answer

Regulation of body temperature

Question 8

Which bone forms the lower jaw and is the only movable bone of the skull?

Accepted Answer

Mandible

Question 9

A patient is diagnosed with an abnormal lateral curvature of the spine. What is this condition called?

Accepted Answer

Scoliosis

Question 10

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object; weight is the force of gravity acting on that mass.

Question 11

Which of the following is the correct conversion for 650 mg to grams?

Accepted Answer

$$650 \div 1000 = 0.65 g$$

Question 12

Which part of the microscope is responsible for adjusting the amount of light passing through the specimen?

Accepted Answer

Iris diaphragm lever

Question 13

If you are using a 10X ocular lens and a 40X objective lens, what is the total magnification?

Accepted Answer

$$10 	imes 40 = 400X$$

Question 14

Why is it important to use both positive and negative controls in a biochemical test for macromolecules?

Accepted Answer

To confirm the reagents are working and to provide a baseline for comparison

Question 15

Which reagent is used to test for the presence of simple sugars, and what color change indicates a high concentration?

Accepted Answer

Benedict's reagent; red or brown

Question 16

A food sample turns blue-black when iodine is added. What does this indicate?

Accepted Answer

The presence of starch

Question 17

Which of the following best explains why the average of three trials is more accurate than a single measurement?

Accepted Answer

It reduces the impact of random errors and increases reliability.

Question 18

In the Biuret test for proteins, what is the expected color change if proteins are present?

Accepted Answer

Blue to violet or purple

Question 19

Which part of the human skeleton is responsible for producing most blood cells through hematopoiesis?

Accepted Answer

Red bone marrow in flat bones such as the pelvis and sternum

Question 20

A Daphnia is exposed to adrenaline during an experiment. What is the most likely effect on its heart rate, based on what is known about adrenaline in mammals?

Accepted Answer

The heart rate will increase.

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