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WorksheetsTest 5 pt 1
Total questions: 20
Worksheet time: 10mins
Which of the following is not related to ribosomal activity?
A site
spliceosomes
codon recognition
P site
Each DNA strand has a backbone that consists of alternating...
sugar and phosphate molecules
purines and pyrimidines
nitrogen-containing bases
hydrogen bonds
Phage with labeled proteins or DNA was allowed to infect bacteria. It was shown that the DNA, but not the protein, entered the bacterial cells, and was therefore the genetic material.
Oswald Avery
Erwin Chargaff
Alfred Hershey and Martha Chase
Frederick Griffith
What kind of chemical bond is found between paired bases of the DNA double helix?
phosphate
Ionic
covalent
hydrogen
Which of the following BEST DESCRIBES where the eukaryotic ribosomal RNA is transcribed?
the nucleus
ribosomes
the Golgi apparatus
the nucleolus
The mRNA has a three-nucleotide sequence called a _, while the molecule transporting the amino acid (tRNA) has a complementary sequence called a(n):
codon; anticodon
doublet code: stop codon
base; complementary base
anticodon; codon
The anti-codon of a particular tRNA molecule is...
complementary to the corresponding triplet in rRNA
changeable, depending on the amino acid that attaches to the tRNA
complementary to the corresponding mRNA codon
the part of tRNA that bonds to a specific amino acid
Cancer cells that are still in their place of origin and have not traveled yet are called....
benign
invasive
malignant
in situ
What are the two stages of gene expression?
translation & transcription
introns & exons
transcription & transpiration
DNA & protein
What does cancer use the enzyme telomerase for?
restoring sections of the telomere lost to mitosis
removing chunks of the telomere after mitosis
none of the above
making new chromosomes to replace the chromosomes lost due to telomere fusing
This is the use of genetic information to direct protein production:
gene expression
exon removal
gene transcription
semiconservative replication
What is the effect of a nonsense mutation in a gene?
It introduces a stop codon into the mRNA.
It has no effect on the amino acid sequence of the encoded protein.
It changes an amino acid in the encoded protein.
It alters the reading frame of the mRNA.
The leading and the lagging strands differ in that....
the leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction.
the leading strand is synthesized continuously, whereas the lagging strand is synthesized in short fragments that are ultimately stitched together.
the leading strand is synthesized by adding nucleotides to the 5' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 3' end.
all of the above are correct
What are the coding segments of a stretch of eukaryotic DNA called?
introns
transposons
exons
codons
Identify the building blocks of nucleic acids.
carbohydrates
phosphate groups
amino acids
nucleotides
To turn genes off, a regulatory protein called a(n) regulatory site so that RNA polymerase is blocked.
operon
translator
signal molecule
repressor
Once transcribed, eukaryotic mRNA typically undergoes substantial alteration that includes...
excision of introns.
fusion into circular forms known as plasmids.
linkage to histone molecules.
union with ribosomes.
Using RNA as a template for protein synthesis instead of translating proteins directly from the DNA is advantageous for the cell because:
Many tRNA molecules can be transcribed from multiple genes, increasing the potential rate of gene expression.
RNA acts as an expendable copy of the genetic material, allowing the DNA to serve as a permanent, pristine repository of the genetic material.
RNA is more stable than DNA.
all of the above are reasons
Translation occurs where in the cell?
the nucleolus
the cytoplasm
a nucleoplasm
the nucleus
Which of the following is information that was gathered by knowing the structure of DNA?
all of the above is information learned from the structure of DNA
how information is stored in the DNA
how evolution occurs through mutation
how DNA is different between species
