Biology, 20.02.2020 18:22 naomicervero
QUESTION 1
Does the following statement describe a function of DNA, a function of RNA, a function of both DNA and RNA, or a function of neither DNA nor RNA? It makes up a main part of the ribosome, where amino acids are attached to one another to make a protein.
DNA
RNA
both DNA and RNA
neither DNA nor RNA
2 points
QUESTION 2
Which of these are the correct base pairs in DNA?
adenine and uracil
cytosine and guanine
cytosine and adenine
thymine and guanine
2 points
QUESTION 3
For the following structural characteristic, decide if it is a characteristic of DNA, a characteristic of RNA, a characteristic of both DNA and RNA, or a characteristic of neither DNA nor RNA. It contains uracil as a base.
DNA
RNA
both DNA and RNA
neither DNA nor RNA
2 points
QUESTION 4
The process of forming two DNA molecules from one is called .
replication
transcription
translation
expression
2 points
QUESTION 5
What is the first step in replication?
forming the replication fork
adding complementary base pairs
unwinding the double helix
correcting mutations
2 points
QUESTION 6
What enzyme is responsible for adding the complementary base pairs during replication?
DNA polymerase
RNA polymerase
DNA ligase
RNA ligase
2 points
QUESTION 7
Because a complementary base pair is added during replication, each new DNA molecule created in replication is .
identical
complementary
mutated
connected
2 points
QUESTION 8
Mutations are avoided during replication because DNA polymerase is able to .
repair itself
repair the DNA
encode a message
add more codes
2 points
QUESTION 9
What are mutations?
changes in nucleotides of a DNA molecule that affect the genetic message
repairs of damage to DNA molecules by specialized enzymes
removal of damaged DNA nucleotides by enzyme molecules
reduction in the rate of replication of DNA due to regulatory mechanisms
2 points
QUESTION 10
If there is no lactose present, how does bacteria respond?
The gene for beta-galactosidase turns on.
The gene for beta-galactosidase turns off.
Lactose is produced.
Beta-galactosidase production increases.
2 points
QUESTION 11
What gene is responsible for tumor suppression?
beta-galactoside
p53
alpha-globin
beta-globin
2 points
QUESTION 12
What is an intron?
a part of DNA that codes for a functional protein
a part of DNA that does not code for a functional protein
the beginning part of the DNA molecule
the end of part of the DNA molecule
2 points
QUESTION 13
What does RNA code for?
DNA
proteins
polypeptides
amino acids
2 points
QUESTION 14
What type of RNA brings amino acids to be attached in sequence according to the information carried in a different type of RNA?
transfer RNA
ribosomal RNA
messenger RNA
nuclear RNA
2 points
QUESTION 15
Which of the following correctly defines translation?
the making of a new DNA molecule by pairing of bases of DNA nucleotides with complementary bases in an existing DNA molecule
the making of an RNA molecule from a DNA strand by pairing of bases of RNA nucleotides with the complementary bases in DNA
the making of a polypeptide with a specified order of amino acids using an RNA molecule to provide the sequence information
the making of a polypeptide with a specified order of amino acids using a DNA molecule to provide the sequence information
2 points
QUESTION 16
A codon consists of how many bases?
1
2
3
4
2 points
QUESTION 17
Which structure of a protein is the second folding of the protein chain?
primary
secondary
tertiary
quaternary
2 points
QUESTION 18
Which of these proteins speed up a biological reaction?
enzymes
antibodies
hormones
inhibitors
2 points
QUESTION 19
When an enzyme lowers the activation energy of a reaction, what happens?
The reaction speeds up.
The reaction slows down.
The reaction remains constant.
The reaction does not occur.
2 points
QUESTION 20
In a biological reaction involving an enzyme, what does not directly participate in the reaction?
the active site of an enzyme
the active site of the substrate
the inactive site of the substrate
the reactant chemicals
2 points
QUESTION 21
What percent of all the genes in E. coli are active all the time?
10%
20%
60%
80%
2 points
QUESTION 22
If a bacterium did not regulate gene expression, what would occur?
wasted energy
conserved energy
created energy
removed energy
2 points
QUESTION 23
What are cells that express the same genes?
similar
different
mutated
not living
2 points
QUESTION 24
What is responsible for morphogenesis?
reproduction
replication
gene expression
apoptosis
2 points
Answers: 1
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Answers: 3
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Answers: 2
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QUESTION 1
Does the following statement describe a function of DNA, a function of RNA, a...
Does the following statement describe a function of DNA, a function of RNA, a...
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