Exam 2: Small Molecules and the Chemistry of Life

A large number of weak _______ that are inconsequential by themselves can amount to an important, large, attractive force between the two surfaces of large interacting biomolecules, such as a small protein and the larger protein bound to it.

Scientists have used glucose labeled with carbon-14 in place of carbon-12 to trace the metabolic fate of glucose fed to mice.Relative to carbon-12, which property of carbon-14 is essential in these types of experiments?

In which column/group of the periodic table would you expect to find elements with five valence electrons?

Refer to the table below. Four samples taken from an underground geologic site were analyzed in a chemistry lab.The table summarizes the elements found in greatest abundance in each sample.Which sample(s) could have originated from living sources?

Which is not an example of a force between two atoms?

Which of the following statements about the atom is true?

Which is an example of how water's high heat of vaporization affects a living organism?

Which statement is true?

For a covalent bond to be polar, the two atoms that form the bond must have

P and P have virtually identical chemical and biological properties because they have the same

Refer to the figure showing reactants before chemical change occurs. Which diagram could represent the products of this change?

An atom is most stable when

The best reference source for the atomic number and mass number of an element is

Prolactin is a peptide hormone produced by the pituitary gland that stimulates breast and milk development in pregnant women.The normal prolactin concentration in a pregnant woman's blood is 10‒209 ng/mL.Because prolactin's molecular weight is 22,000 g/mole, a concentration of 110 ng/mL is equivalent to a concentration of 5 nM (nanomolar).Compared with the concentration of most molecules in the blood, the concentration of prolactin is significantly _______.

Isotopic analysis of biological samples can be a useful tool in the study of

The five statements below describe properties of radioisotopes.Which statement is best used to justify the use of a radioisotope as a treatment for destroying cancer cells in human patients?

Refer to the figure below. The figure shows the molecular structure of methanol.One type of hydrogen bond has been observed to form between molecules of methanol.Which diagram shows the most likely set of atoms involved in these hydrogen bonds?

Refer to the figure below. An oxygen atom by itself is very reactive, whereas an oxygen atom that has combined with two hydrogen atoms to form a water molecule is very stable.What explains this observation?

The ability of an atom to combine with other atoms is determined by the atom's

An atom has 36 protons and 44 neutrons.This atom has atomic number 36, and its atomic symbol is _______.