Bio Final Exam 1

All the organisms on your campus make up

A community

Systems biology is mainly an attempt to

Understand the behavior of entire biological systems by studying interactions among its component parts.

Which of the following best demonstrates the unity among all organisms?

the structure and function of DNA

A controlled experiment is one that

Tests experimental and control groups in parallel.

Which of the following statements best distinguishes hypotheses form theories in science?

Hypotheses usually are relatively narrow in scope; theories have broad explanatory power.

Which of the following is an example of qualitative data?

The fish swam in a zigzag motion.

Which sentence best describes the logic of scientific inquiry?

If my hypothesis is correct, I can expect certain test results.

In the term trace element, the adjective trace means that

The element is required in very small amounts.

Compared with 31P, the radioactive isotope 32P has

one more neutron

The reactivity of an atom arises from

The existence of unpaired electrons in the valence shell.

Which statement is true of all atoms that are anions?

The atom has more electrons than protons.

Which of the following statements correctly describes any chemical reaction that has reached equilibrium?

The rates of the forward and reverse reactions are equal.

We can represent atoms by listing the number of protons, neutrons, and electrons for example, 2p+, 2n^0, 2e- for helium. Which of the following represent the 18O isotope of oxygen?

8p+, 10n^0, 8e-

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound.

H2S

What coefficients must be placed in the following blanks so the all atoms are accounted for in the products?

C6H12O6 → __ C2H6O + __ CO2

2;2

Which of the following is a hydrophobic material?

wax

We can be sure that a mole of table sugar and a mole of vitamin C are equal in their

number of molecules

Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?

10^-4M

Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?

10^-10M

A slice of pizza has 500 kcal. IF we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.)

10 degree C

Organic chemistry is currently defined as

the study of carbon compounds.

Which functional group is not present in this molecule?

Sulfhydryl

Which chemical group is most likely to be responsible for an organic molecule behaving as a base?

amino

Visualize the structural formula of each of the following hydrocarbons. Which hydrocarbon has a double bond in its carbon skeleton?

C2H4

Choose the term that correctly describes the relationship between these two sugar molecules:

Structural isomers

Which action could produce a carbonyl group?

the replacement of the -OH of a carbonyl group with hydrogen

Which of the following categories includes all others in the list?

carbohydrate

The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are in the form. Which of the following could amylase break down?

Glycogen, starch, and amylopectin

Which of the following is true of unsaturated fats?

They have double bonds in their fatty acid chains.

The structural level of a protein least affected by a disruption in hydrogen bonding is the

primary level

Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes?

The phosphodiester linkages of the polynucleotide backbone would be broken.

The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions?

C60H102O51

Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA?

5’-ATGC-3’ with 5’-GCAT-3’