Microbiology Flashcards For Exam 3

Front 1

These nitrogeous bases are composed of two fused heterocyclic rings

Back 1

purines

Front 2

Thymine and uracil are these

Back 2

pyrimidines

Front 3

this term refers to a nitrogenous base with a sugar attached

Back 3

nucleoside

Front 4

nirogenous bases are attached to this numbered carbon in the sugar

Back 4

1'

Front 5

if the percentage of adenine in a bacteria genome is 20% then the percentage of cytosine is this

Back 5

30%

Front 6

converts a double-standed DNA region into two single-stranded
regions

Back 6

helicase

Front 7

synthesized a short RNAsegement, required for DNA synthesis

Back 7

primase

Front 8

this DNA polymerase is involved in DNA repair and not replication

Back 8

DNA polumerase II

Front 9

removes the RNA segements and replaces them with DNA

Back 9

DNA polymerase I

Front 10

The sequence that RNA polymerace
binds to initiate transcription

Back 10

promoter

Front 11

this polymerase transcribe 5S rRNA in eukaryotes

Back 11

RNA polymerase III

Front 12

this is the number of Archael RNA polymerases

Back 12

1

Front 13

The number if different in the E.coli RNA polymerase

Back 13

4

Front 14

if the mRNA transcript reads UAC, then the corresponding sequence on the DNA non-template strand would read this

Back 14

TAC

Front 15

the most used start codon is this

Back 15

AUG

Front 16

This is the number of sense condons

Back 16

61

Front 17

stop codons include UAG, UAA and this

Back 17

UGA

Front 18

exceptions to the universality of the genetic code exist in this bacterium

Back 18

mycoplasma

Front 19

if the codon consisted of four NOT three bases, the number of possible codons would be

Back 19

256

Front 20

the O in lacO stands for this

Back 20

operator

Front 21

the gene lacZ encodes this enzyme

Back 21

beta-galactosidase

Front 22

the enzyme beta-galactoside permease is encoded by this gene

Back 22

lay Y

Front 23

when this binds to the operator, transcrition of the lac operon genes is turned off

Back 23

repressor

Front 24

the inducer of the lac operon is this

Back 24

allolactose

Front 25

the specific allelic composition of an organism is termed this

Back 25

genotype

Front 26

this is the number of asymmetrical grooves formed outside of the DNA double helix

Back 26

2

Front 27

this is a structure composed of two or more ribosomes associated with a single mRNA molecule

Back 27

polysome

Front 28

the lenght of the nucleotide sequence between a start and stop codon is termed this

Back 28

open reading frame

Front 29

A gene that is expressed continuosly by the cell is termed this

Back 29

constitutive

Front 30

The name of this class

Back 30

microbiology