Exam 2: Chemical Principles

Covalent bonds are always shared equally.

Table 2.1 -Using the information in Table 2.1, calculate the number of moles in 92 grams of ethanol, C₂H₅OH.

Which of the following is the type of bond holding K⁺and I^-ions in KI?

Which of the following statements is FALSE?

Which of the following pairs is mismatched?

Two antiparallel strands of DNA combine to form a double helix. The specific interactions that permit this phenomenon occur by way of bonds between .

Figure 2.1 -Which compound in Figure 2.1 is an ester?

Radioisotopes are frequently used to label molecules in a cell. The fate of atoms and molecules in a cell can then be followed. Assume Saccharomyces cerevisiae is grown in a nutrient medium containing the radioisotope ³²P. After a 48- hour incubation, the majority of the ³²P would be found in the S. cerevisiae's

The density of liquid water is greater than the density of ice.

All forms of life function optimally at a pH of 7.

What is the type of bond holding hydrogen and oxygen atoms in the H₂O molecule?

An E. coli culture that has been growing at 37°C is moved to 25°C. Which of the following changes must be made in its plasma membrane?

Table 2.2 -Which of the following statements about the reactions in Table 2.2 is FALSE?

A scientist wants to perform a test that will indicate whether a nucleic acid sample is composed of RNA or DNA. Testing for the presence of which of the following is most appropriate in this situation?

Structurally, ATP is most like which type of molecule?

Figure 2.2 -Archaea differ from bacteria in the composition of the cell membrane lipids. Archaea have Ether- bonded lipids, shown in part _ of Figure 2.2, and bacteria have ester- bonded lipids, shown in part of Figure 2.2.

Which type of molecule contains the alcohol glycerol?

Which type of molecule NEVER contains a phosphate group?