BIOL 3134 Practice Exam 1

Question 1

Which of the following is NOT a method of breaking cells and tissues?

Accepted Answer

Centrifuge

Question 2

Which type of bond is the strongest?

Accepted Answer

Covalent bonds

Question 3

In thermodynamics, what does the term “free energy” refer to?

Accepted Answer

Energy that can be harnessed to do work/drive chemical rxns

Question 4

Which of the following atoms is most likely to participate in an ionic bond?

Accepted Answer

Chlorine, with 7 valence electrons

Question 5

The atomic number of potassium is 19. What is the charge of the most stable form of potassium?

Accepted Answer

K+

Question 6

Which statement is true about the breakdown of polymers?

Accepted Answer

The reaction is associated with a negative ΔG.

Question 7

Which of the following describes spontaneity?

Accepted Answer

ΔG

Question 8

Carbon has 4 valence electrons. What is the maximum number of bonds can carbon form?

Accepted Answer

4

Question 9

Which term describes a covalent bond in which electrons are shared unequally?

Accepted Answer

Polar

Question 10

What do eukaryotic cells have that prokaryotes lack?

Accepted Answer

A nucleus and other internal organelles

Question 11

Which subatomic particles undergo rearrangements when atoms combine with others to form bonds?

Accepted Answer

Electrons

Question 12

Which of the following does NOT follow the first law of thermodynamics?

Accepted Answer

creating heat energy to burn foodstuffs

Question 13

An oxygen atom with 6 valence electrons has the ability to form a max of how many bonds?

Accepted Answer

2

Question 14

A reaction occurs spontaneously only if the change in free energy (∆G) is:

Accepted Answer

negative

Question 15

Which type of microscopy was used to view to see this?

Accepted Answer

Light microscope

Question 16

Which of the following molecules will best dissolve in water?

Accepted Answer

B

Question 17

Individual atoms can be seen with an electron microscope

Accepted Answer

False

Question 18

Which of the following results in increased disorder?

Accepted Answer

Dissolving salt in water

Question 19

This bond is longest in length

Accepted Answer

van der Waals

Question 20

Early studies of Drosophila melanogaster showed that:

Accepted Answer

genes are carried on chromosomes

Question 21

Which of the following type of microscopy was used?

Accepted Answer

Scanning electron microscope

Question 22

Which of the following covalent bonds is polar?

Accepted Answer

–N–C

Question 23

The DNA in the nucleus of eukaryotic cells is separated from the cytoplasm by the:

Accepted Answer

Nuclear envelope

Question 24

Which of the following is frequently studied as a model vertebrate?

Accepted Answer

Zebrafish

Question 25

If ΔG is negative, a reaction or process occurs faster.

Accepted Answer

False

Question 26

If ΔG >0, then the reaction can be best described as:

Accepted Answer

Endergonic

Question 27

In living organisms, 4 elements make up 97% of an organisms weight. What are these elements?

Accepted Answer

Carbon, hydrogen, nitrogen, and oxygen

Question 28

Between water molecules, hydrogen bonds form between:

Accepted Answer

O and H

Question 29

The formation of ATP is an energetically favorable reaction

Accepted Answer

False

Question 30

The atomic number of fluorine is 9. What is the charge of the most stable form of fluorine?

Accepted Answer

F-

Question 31

Chemical reactions proceed spontaneously only in the direction that:

Accepted Answer

leads to a loss of free energy

Question 32

Which of the following best describes the bond between O and H in water

Accepted Answer

Polar covalent bond

Question 33

Which of the following type of microscopy was used?

Accepted Answer

Transmission electron microscope

Question 34

Which of the following will NOT allow a lipid bilayer to form spontaneously assuming ∆H is low?

Accepted Answer

when T is high with a decrease in entropy (∆S)

Question 35

Which statement is NOT true of E. coli?

Accepted Answer

E. coli is a model eukaryote

Question 36

What dictates the number of bonds an atom can make?

Accepted Answer

The state of its outermost electron shell

Question 37

Because they generate order, living cells defy the second law of thermodynamics.

Accepted Answer

False

Question 38

Which statement is true about the removal of a terminal phosphate from ATP?

Accepted Answer

The reaction is energetically favorable.

Question 39

Which of the following describes the energy harnessed to do work or drive a chemical reaction?

Accepted Answer

G

Question 40

Isotopes of the same element have different numbers of what type of subatomic particle?

Accepted Answer

Neutrons

Question 41

Which is NOT true of a reaction at chemical equilibrium?

Accepted Answer

Both the forward & reverse reactions have completely stopped

Question 42

This bond is shortest in length

Accepted Answer

Covalent bond

Question 43

What type of bond is formed when two atoms share electrons?

Accepted Answer

Covalent bonds

Question 44

Hydrogen bonds are stronger than covalent bonds

Accepted Answer

False

Question 45

What is the cell theory?

Accepted Answer

All cells are formed by the division of preexisting cells.

Question 46

The atoms found in tissues all have complete valence shells and are stable on their own.

Accepted Answer

False

Question 47

Which of the following is a model plant used by scientists?

Accepted Answer

Arabidopsis thaliana

Question 48

The atomic number of oxygen is 8. What is the charge of the most stable form of oxygen?

Accepted Answer

O2-

BIOL 3134 Practice Exam 1

Questions 48

BIOL 3134 Practice Exam 1

Questions 48