Which of the following classes of biological molecules includes enzymes?

The statement that best supports the grant proposal is a. Repeating the published work will provide independent confirmation of the results. Independent confirmation of results is an important part of the scientific process. By repeating an experiment that was recently published by another researcher, the researcher writing the grant proposal can provide additional evidence to support or refute the original findings.

B. Repeating published work with changed variables will extend the previous results, but this is not the main goal of repeating an experiment.

C. Funding this important research will benefit science in the long term is a general statement that does not specifically support the grant proposal to repeat an experiment.

D. Funding this grant proposal will allow this laboratory to continue to study this topic is also a general statement that does not specifically support the grant proposal to repeat an experiment.

To accurately measure the density of a series of small irregular solids made of plastic, wood, fiberglass, and glass, a student will need a graduated cylinder, water, and a weighing balance. The student can use the water displacement method to determine the volume of each solid by measuring the volume of water displaced when the solid is submerged in a graduated cylinder filled with water. The mass of each solid can be measured using a weighing balance. The density can then be calculated by dividing the mass by the volume.

The other options are not correct because they do not provide the necessary tools to accurately measure the density of the solids. A spectrophotometer is used to measure light absorption and is not necessary for measuring density. A graduated beaker is less accurate than a graduated cylinder for measuring volume. A Bunsen burner is used for heating and is not necessary for measuring density.