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Flashcards in EXAM 2 Deck (50)
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1

Aerobic cellular respiration requires that oxygen be present.

True

2

Krebs cycle is located in the matrix of the mitochondria.

True

3

Chargaff's rules state that in DNA the totalled proportions of adenine and thymine always equal the totalled proportions of guanine and cytosine.

False; totalled proportions of adenine and guanine always equal those of thymine and cytosine.

4

Ribosomes move along mRNA in a 5'-->3' direction

True

5

If an X-ray technician suffered genetic damage, it would most likely be due to chemical mutagenic agents.

False; physical mutagenic agents

6

Kidney's remove waste, balance blood pH, and maintain water balance.

True

7

Insulin is produced in a healthy person when blood sugar is low.

False; when blood sugar is high

8

Insulin secretion must be decreased during times of stress to keep blood glucose level high.

True

9

Information from your brain is moved to your leg muscles by motor neurons.

True

10

Electrochemical messages are carried by the movement of ions through the nerve membrane.

True

11

In living organisms, buffers do which of the following?

Maintain pH in the cells within a narrow range, allowing the enzymes to function.

12

When atoms from two different elements are brought together under conditions that will favour a reaction and they have similar electronegativities, which type of chemical bond is most likely to form?

Non-polar covalent bonds

13

Structurally, a sulfhydryl group is most similar to which of the following?

Hydroxyl

14

A nitrogen atom would be found bonded to a hydrogen atom in which of the following functional groups?

amino

15

Which of the following functional groups would be found in a monosaccharide?

carbonyl and hydroxyl

16

When digested, which of the following substances would yield a mixture of amino acids?

protein

17

Of the list of compounds below, which one cannot result in the production of urea, a nitrogen-containing waste product found in urine?

glucose

18

When two organic molecules are joined together and a water molecule is removed, the reaction is called which of the following?

dehydration synthesis (condensation)

19

The extremely large diversity of structure seen in proteins is mainly due to...

different numbers, kinds, and sequences of amino acids.

20

During the process of glycolysis, some hydrogen atoms are essentially removed from glucose. This is an example of...

oxidation

21

The key point about oxidation is that it is a process in which

there is a loss of electrons

22

When free energy is released during a chemical reaction it is called

an exergonic reaction

23

The activity of an enzyme can be altered by changing the pH of its surroundings slightly. This change in pH works by

altering its three-dimensional shape

24

at the end of the electron transport chain, the final product is which of the following?

water

25

Redox reactions involving Fe2+ and Fe3+ occur during aerobic cellular respiration. Where do these reactions take place?

The electron transport chain

26

From the following list, which is the best definition of anaerobic respiration?

Cellular metabolism in the absence of oxygen

27

Anaerobic and aerobic respiration are similar in all but one of the following ways. Which one is the exception?

acetylhyde is converted into ethanol

28

During DNA replication, the function of RNA primers is to

serve as starting points for DNA strand elongation by DNA polymerase III in prokaryotes.

29

5'GGCATA (X)
(Z)CCGTAT (Y)
If the above is a representation of a piece of double-stranded DNA, what symbols should occupy the positions (X), (Y) and (Z)?

3',5',3'

30

In what order do the following molecules become involved in DNA replication in E.coli?
1. single-stranded binding proteins
2. DNA polymerase III
3. primase
4.helicase

4,1,3,2
(helicase, single-stranded binding proteins, primase, DNA polymerase III)