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Exam 2: Chemical Principles

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Question 21

True/False

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The formation of ADP from ATP can be defined as a hydrolytic reaction.

A) True
B) False

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Question 22

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Most amino acids found in cells demonstrate what type of chirality?

A) A-isomers
B) L-isomers
C) D-isomers
D) C-isomers
E) B-isomers

F) A) and C)
G) A) and E)

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Question 23

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There are some forms of life on Earth that can survive without water.

What is the type of weak bond between the hydrogen of one molecule and the nitrogen of another molecule, where the two donʹt actively share an electron?

Covalent bonds are always shared equally.

Identify the following reaction: HCl + NaHCO3 → NaCl + H₂CO3

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

Identify the following reaction: NH4OH ⇌ NH3 + H₂O

Describe how the properties of phospholipids make these molecules well suited for plasma membranes.

Identify the following reaction: Glucose + Fructose → Sucrose + Water

Which of the following statements is FALSE?

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 35S. After a 48-hour incubation, the 35S would most likely be found in the S. cerevisiaeʹs

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?

All chemical reactions are, in theory, reversible.

Which of the following is a base?

What is the type of strong chemical bond between carbon, hydrogen, and oxygen atoms in a single organic molecule?

What do genes consist of?

Which of the following pairs is mismatched?

Based upon the valence numbers of the elements magnesium (2) and hydrogen (1) , predict how many covalent bonds would form between these atoms to achieve the full complement of electrons in their outermost energy shells.

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. cerevisiaeʹs