Test
Ch 4 DNA, RNA, and the Flow of Genetic Information
Este test tiene tipos de pregunta que se abren en el reproductor de siempre.
Preguntas del test (48)
1What is the correct order of the central dogma of gene expression?
- ADNA--> Translation-->RNA--> Transcription-->Protein
- BDNA--> Transcription-->RNA-->Translation-->Protein
- CRNA-->Transcription-->DNA-->Translation-->Protein
- DRNA-->Translation-->DNA-->Transcription-->Protein
2What are components of a nucleotide?
- ASugar
- BNitrogen containing base
- CPhosphate
- DCarbon
3RNA and DNA differ in the sugar component of one of the bases
- AVerdadero
- BFalso
4What contains the sugar ribose?
- ARNA
- BDNA
- CmRNA
- DtRNA
5Purines are
- AAdenine and Guanine
- BAdenine and Cytosine
- CGuanine and thymine
- DCytosine and thymine
6Pyrimidines are
- AAdenine and guanine
- BAdenine and thymine
- CCytosine and adenine
- DCytosine and thymine
7Nucleic acid sequences are written in what direction?
- AOne end has a phosphoryl group attached to the 3'carbon atom of the sugar and one end has a free hydroxyl attached to the 5' carbon of the sugar
- BOne end has a phosphoryl group attached to the 5' carbon atom of the sugar and one end has a free hydroxyl attached to the 3' carbon of the sugar
8A base bound to a sugar is called a [blank_start]nucleoside[blank_end]
- Anucleoside
9Nucleoside of DNA are
- ADeoxyadenosine, deoxyguanosine, deoxycytidine, and deoxythymidine
- BAdenine, guanine, cytosine, thymine
- Cdeoxyadenosine, deoxyguanosine, deoxycytosine, deoxyuracil
10Deoxythymidine, rarely occurs in RNA, simply called thymidine
- AVerdadero
- BFalso
11Nucleoside of RNA are
- Adeoxyadenosine, deoxyguanosine, deoxycytidine, and deoxythymidine
- Badenosine, guanosine, cytidine, and uridine
- Cadenosine, guanosine, cytidine, thymidine
- Ddeoxyadenosine, deoxyguanosine, deoxycytidine, and deoxyuracil
12A nucleotide is a nucleoside with only 1 phosphoryl group attached
- AVerdadero
- BFalso
13Nucleotide [blank_start]triphosphates[blank_end] are the building blocks of [blank_start]DNA[blank_end] and [blank_start]RNA[blank_end]
- Atriphosphates
- BAdenosine
- Ctrisugars
- DDNA
- EtRNA
- FmRNA
- GRNA
- HmRNA
- ItRNA
14DNA molecules are very long some consisting of more than [blank_start]1 billion[blank_end] nucleotides
- A1 billion
15The double helix is stabilized by hydrogen bonds and van der Walls interactions
- AVerdadero
- BFalso
16Adenine always forms hydrogen bonds with [blank_start]thymine[blank_end] while guanine forms hydrogen bonds with [blank_start]cytosine[blank_end]
- Athymine
- Bcytosine
- Ccytosine
- Dthymine
17The helix is stabilized by hydrogen bonds between base pairs as well as hydrophobic interactions called
- Astacking forces
- Bsemiconservative replication
- CVan der Walls interactions
18Because of the base pair rules, the sequence of one strand determines the sequence of the partner strand
- AVerdadero
- BFalso
19Because the two daughter helices have one parent strand one newly synthesized strand, the replication process is called
- AStacking forces
- BSemiconservative replication
- CConservative replication
- DDNA polymerase
20What are the key characteristics of DNA synthesis
- AFour deoxynucleoside triphosphates and Mg2+ are required
- BA template strand is used to direct RNA synthesis
- CA primer from which the new strand grows must be absent
- DMany DNA polymerases have nuclease activity that allows for the removal of mismatched bases
21Some viruses, such as tobacco mosaic virus, have [blank_start]RNA[blank_end] genomes that are replicated by [blank_start]RNA[blank_end]-directed [blank_start]RNA[blank_end] polymerases
- ARNA
- BRNA
- CRNA
22Retroviruses, such as HIV-1, have single-stranded RNA genomes that are converted into DNA double helices by the action of
- ATranscriptase
- BTranslation
- CReverse transcriptase
- DReverse translation
23All cellular RNA is synthesized by RNA polymerases
- AVerdadero
- BFalso
24The synthesis of RNA from a DNA template is called translation, a process catalyzed by RNA polymerase
- AVerdadero
- BFalso
25RNA polymerase has the following requirements
- ATemplate
- BThe sequence of the newly-synthesized RNA is complementary to the DNA template
- Ccoding strand
- DActivated precursors in the form of the 4 ribonucleoside
- EDivalent metal ions
- FBase pair
26RNA polymerase initiates and elongates the RNA product, with the chain growing in the [blank_start]5'[blank_end] to [blank_start]3'[blank_end] direction
- A5'
- B3'
27Several kinds of RNA play a role in gene expression, what are three most abundant classes of RNA
- ARibosomal RNA
- BMessenger RNA
- CTransfer RNA
- DTranslate RNA
28RNA polymerases take instructions from DNA templates
- AVerdadero
- BFalso
29Transcription begins near the [blank_start]promoter[blank_end] sites and ends at [blank_start]terminator[blank_end] sites
- Apromoter
- Bterminator
30Promoters are
- ASpecific DNA sequences that direct RNA polymerase to the proper initiation site
- BSpecific RNA sequences that direct DNA polymerase to the proper initiation site
- CSpecific DNA sequences that direct RNA polymerase to the proper terminator site
- DSpecific RNA sequences that direct DNA polymerase to the proper terminator site
31The average of variation in the sequence of a promoter for different genes is called [blank_start]consensus[blank_end] sequence
- Aconsensus
32The RNA complement of the DNA stop signal forms a hairpin structure, followed by several thymine residues
- AVerdadero
- BFalso
33What is required for transcription termination
- AProtein rho
- BProtein thy
- CProtein gly
- DProtein leu
34In eukaryotes,
- AThe 3' end of mRNA is modified by the attachment of a cap structure while the 5' end acquires a poly(A)tail
- BThe 5' end of mRNA is modified by the attachment of a cap structure while the 3' end acquires a poly(A)tail
- CThe 5' end of tRNA is modified by the attachment of a cap structure while the 3' end acquires a poly(A)tail
- DThe 3' end of tRNA is modified by the attachment of a cap structure while the 5' end acquires a poly(A)tail
35Transfer RNA molecules react with
- Aspecific amino acids in a reaction catalyzed by aminoacyl-tRNA synthetases
- Bone amino acids in a reaction catalyzed by aminoacyl-tRNA synthetases
- Cspecific amino acids in a reaction catalyzed by aminoacyl-mRNA synthetases
- DSpecific amino acids in a reaction catalyzed by aminoacyl-rRNA synthetases
36Transfer RNA molecules also contain a template recognition site, called
- Athe anticodon
- Bthe codon
- Cthe initiator
- Dthe terminator
37Anticodon consist of
- A2 bases
- B3 bases
- Ccomplementary 3 base sequence in the rRNA
- Dcomplementary 3 base sequence in the mRNA
38Protein synthesis is the process of translation
- AVerdadero
- BFalso
39Characteristics of the genetic code are
- Athree nucleotides, called a codon
- Bcode is overlapping
- Ccode is nonoverlapping
- Dcode has punctuation
- Ecode has no punctuation
- FCode is read from 5' end of the mRNA to the 3' end
- Gcode is degenerate in that some amino acids are encoded by more than one codon
40Degeneracy
- Aamino acids encoded by 1 codon
- Bamino acids encoded by more than 1 codon
- Cminimizes deleterious effects of mutations
- Dmaximizes deleterious effects of mutations
41Messenger RNA is translated on ribosomes
- AVerdadero
- BFalso
42The genetic code is nearly universal
- AVerdadero
- BFalso
43Eukaryotic genes are discontinuous
- Awith coding regions called exons, interrupted by noncoding regions called introns
- Bwith noncoding regions called introns, interrupted by coding regions called exons
- Cwith coding regions called introns, interrupted by noncoding regions called exons
- Dwith interrupted regions called exons, coding regions called introns
44Many exons encode
- Aprotein domains
- Bamino acids
- CrRNA
45Introns almost always begin with GU and end with an AG
- AVerdadero
- BFalso
46The gene for the β- chain of human hemoglobin has [blank_start]3[blank_end] exons and [blank_start]2[blank_end] introns
- A3
- B2
47RNA processing generates mature RNA
- AVerdadero
- BFalso
48[blank_start]Pre-messeneger[blank_end] RNA contains exons and introns
- APre-messeneger
- BtRNA
- CmRNA
- DrRNA
Información
- Descripción
- Biochemistry
- Autor
- Amy Arce
- Idioma
- English
- Visitas
- 57
- Historial
- Creado el 5 oct 2015 · actualizado el 16 oct 2016
- Etiquetas
- Valoración
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