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Exam #2 Practice-Spring 23 Flashcards | StudBud
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Exam #2 Practice-Spring 23
Exam #2 Practice-Spring 23
30 terms
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StudBud Administration
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Lac Operon and Gene Expression, microbial nutrition
Flashcards
30 cards
F
Practice quiz
P
Host live
L
Questions
30
Answers
1
The term facultative refers to _________.
existing in a very narrow niche
using light for energy production
the ability to exist in a wide range of conditions
using oxgen for metabolism
2
These to two components must be present to have a functional operon.
promoter & demoter
operator and promoter
operator and repressor
promoter and lac z
3
The model of the enzyme-substrate interations
lock and key
bullet and gun
I have no clue
ball and chain
4
This is the process of converting DNA to RNA
Translation
Transcription
Synthesis
Replication
5
Creutzfeldt-Jacob disease is _____
initiated by an oncogenic virus
cuased by a chronic latent virus
caused by a viroid
a spongiform encephalopathy of humans
6
The primary purpose of viral cultivation is to ______.
isolate and identify viruses in clinical specimens
research on viral structure, lifestyle, genetics, and effects on host
perform wide-scale harvesting of viruses
prepare viruses for vaccines
7
An organism that grows slowly in the cold but has an optimum growth temperature of 30 degrees C is an
psychrophile
thermophile
psychrotolerant microbe
extremophile
8
The concept of genetic information flowing from DNA to RNA to Protein is known as...
DNA
Genes
Central Dogma of Molecular Biology
protein
9
Microbes in a biofilm use quorum sensing to ________.
attach to surfaces
assess the size of a particular microbial population
transfer genetic material amond individual cells
inactivate antibiotic molecules
10
Tamiflu's mechanism of action?
interferes with the metabolic properties of the virus
interferes with the replication of +ssRNA form the -ssRNA of flu
interferes with the release of budding viruses from the infected host cells
blocks protein synthesis of viral genome
11
What causes the repressor protein to release form the operator region of the lac operon?
lactose
arabinose
RNA polymerase
DNA polymerase
12
A group of 3 nucleotides is known as a....
flodon
trio
codon
pairing
13
What is the function of the promoter region?
binding site for DNA polymerase
site where DNA synthesis begins
binding site for RNA polymerase
binding site for lactose
14
How are viroids transmitted?
plant seeds
respiratory secretions
blood products
sex
15
What is the function of the lac operon?
make lactose
hide lactose
process and digest lactose
synthesize lactose
16
New, noneveloped virus release occurs by _______
exocytosis
budding
both lysis and budding
both budding and exocytosis
17
A group of genes that is regulated together is known as?
DNA polymerase
RNA
operon
protein
18
In order to replicate within a host cell, a virus with a genome comprised of SS RNA+
genome strand is template to make (-) RNA for packaging
1st make a (-) RNA then serve as template to synthesize (+) RNA
use its genome strand to make (+) RNA for packaging
1st make cDNA from genome strand
19
This is a an accessory piece of DNA found in bacteria, it is not a part of the main chromosome
axis
tid bit
chromosome
plasmid
20
A plasmid is a short circular piece of what?
DNA
RNA
lipids
proteins
21
E. coli bacteria normally live in the human gut and produce vitamin K that the body uses. This relationship is _________
mutualistic
parasitic
saprobic
antagonistic
22
What binds to the operator region?
RNA
Repressor protein
RNA polymerase
DNA polymerase
23
An organic nutrient that cannot be synthesized by the organism and must be provided is called ________
micronutrient
macronutrient
vitamin
growth factor
24
In what organism is the lac operon found?
babies
lactobacillus
S.aureus
E.coli
25
mRNA codons code for...
DNA
amino acids
proteins
lipids
26
Where did Drake start from ?
Costco
Del Taco
bottom
top
27
The process of converting mRNA code to a protein is known as?
splicing
translation
mutation
transcription
28
All of the following could find a location in or on human body tissues suitable for growth except ________.
mesophiles
capnophiles
anaerobes
psychrophiles
29
In transduction, the viral genome ________.
replicated in the nucleus
includes DNA from the previous host
initiates lysis of the host
replicated in the cytoplasm
30
Information in cells flows from DNA to _______ to Protein
Bacteria
DNA
Carbohydrate
RNA
