BIO 240 Exam 3

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1

In Stage 1 photosynthesis, a porton gradient is generated and ATP is synthesized. Where do protons become concentrated i the cytoplast?

thylakoid space

2

In the electron-transport chain in chloroplasts, _______-energy electrons are taken from ________.

low; H2O

3

Which of the following statements is false?
a. e- donated by NADH to the NADH dehydrogenase complex can pump more protons than e- donated by FADH2 to u.
b. The ph in the mitochondrial inter membrane space is higher than the pH in the matrix. c
c. The difference in portion concentraiotn across the inner michondrial membrane represents a chemical and electrical potential that can be used to perform work.
d. e- being passed saolng the mitochondrial inner membrane reps a series of redox reactions

b

4

Photo is a process.....Where are the proteins of the e- transport chain located in chloroplasts?

thylakoid membrane

5

The pathways for contents to move from the extracellular space inside the cell is the ____ pathway

endocytic

6

In which cellular location would you expect to find ribosomes translating mRNAs that encode ribosomal proteins?

in the cytosol

7

What of the following mechanisms contributes to a protein gradient during the light reactions of photo?

more than one

8

The DNA from two different species can often be distinguished by a difference in the ______

ration of A = T to G = C

9

Which iof the following sequences gives the strongest base pair with itself?

CG bonds more

10

Ina DNA double helix, ________

purines pair with pyrimidines

11

DNA molecules, like proteins, consist of a single, long polymeric chain that is assembled from small monomeric subunits
a. true
b. false

true

12

the polarity of a DNA strand results from the polarity of sugar back bone
a. true
b. false

false

13

Which if the following carbon of the ribose sugar differs between RNA and DNA?
1234

2

14

Which DNA replication is considered semiconservative because

ea daughter DNA molecule consists of one strand from the parent DNA molecule and one new strand

15

Which of the following chemical groups is not used to construct a DNA molecule?

six-carbon sugar

16

RNA in cells differ from DNA in that _________

it is a single-stranded and can fold up into a variety of structures

17

Which of the following statements about the newly synthesized strand of a human chromo is true?

It was synthesized from multiple origins by a mixture of continuous and discontinuous DNA synthesis

18

Which type of replication machinery accounts for the characteristic?

sliding clamp

19

If the genome of the bacterium E.Coli requires about 20 mins to replicate itself, how can the genome of the fruit fly be replicated in only 3 mins

fruit fly DNA contains more origins of replication than E. COli

20

Gene sequence does not necessarily correspond exactly to the mRNA molecule that it translated to make a protein

true

21

the process of DNA rep requires that ea of the parental DNA strands be used as a ______ to produce a duplicate of the opposing strand.

template

22

In a cromo, ea strand of DNA on that particular chromo may contain genes
a. true
b. false

true

23

hoe does the total number of replication origins in bacterial cells compare with the number of origins in human cells?

1 vs 10000

24

Which of the following properties do you expect the mutant polymerase to have?

It will have more likely to generate mismatched base pairs

25

What is the enzyme involved in DAN replication that is responsible for handling over winding of the helix that van result formation of the replication fork?

topoisomerase

26

Telomerase serves as caps at the ends f linear chromosomes. Which of the following is not true regarding the replication of telomeric sequences?

Additional repeated sequences are added to the template strand

27

The dark reactions take place in the chloroplast matrix
a. true
b. false

false

28

The ATP synthase found in chloroplasts is structurally similar to the ATP synthase in mitochondria. Where in the chloroplast is the phosphorlation of ADP occur?

Stroma

29

For a cells's genetic material to be used, the info is first copied from the DNA into the nucleotide sequence of RNA in a process called _______?

transcription

30

The photosystems in chloroplasts contain hundreds of chlorophyll molecules, most of which are part of

the antenna complex

31

The calvin cycle of photo sometimes referred to as the dark reactions, involves the reduction of CO2 to produce organ in compounds such as sucrose. What cofactor os the e- honor for carbon fixation

NADPH

32

Besides cytochrome b6-f complex, what is also contributing to the proton gradient in the chloroplast during cyclical light reaction?

oxidation water

33

To which molecule does Rubisco attach CO2 during 1 st step of Calvin Cycle

ribulose 1,5-bisphate

34

The nucleotie sequence at he replication is rich in C and T
a. true
b. false

false

35

Primase beings DNA replication by adding a short set ion of DNA to the template strand. a
a. true
b. false

false

36

The term describing the point where the DNA double stranded helix is being unwound during replication is called _______

replication fork

37

To which carbon is the ribose sugar used in nucleic acid is the nitrogenous base

1

38

Transcription is similar to DNA replication in that ______

nucleotide polymerization occurs only in the 5-3 direction