NEW
Font size
WorksheetsChromosome organization and molecular structure
Total questions: 16
Worksheet time: 8mins
Which of the following supports the argument that viruses are nonliving?
Their DNA does not encode proteins
They have RNA rather than DNA
They are not cellular
They do not evolve
What kind of genetic material can be found in viruses?
dsDNA
RNA
ssDNA
All of the above
Viruses _____.
use the host cell to copy themselves and then viruses to synthesize their own proteins
metabolize food to produce their own ATP
use the host cell to copy themselves and make viral proteins
manufacture their own ATP, proteins, and nucleic acids
Which of the following features would characterize a lytic cycle of viral infection?
it endows the host bacterium with the ability to cause disease
it always leads to lyses of the host cell
it is seen only with viruses that infect bacteria
it is seen only with viruses that infect plants
Which statement is incorrect about bacterial chromosomes
Are circular in shape
There can be multiple copies of chromosomes in a bacterial cell
Consist of only structural genes
There is a single origin of replication
How are circular bacterial chromosomes compacted to fit a bacteria cell?
First the circular chromosome get folded into loop domains then further supercoiled
First the circular chromosome get supercoiled then further folded into loop domains
First the circular chromosome enters the cell and produces copies of itself with the host material
First the circular chromosome become uncoiled then cut using enzymes
Negative supercoiling is mediated by DNA Gyrase to introduce twists in the circular chromosome
True
False
Positive supercoiling relaxes the twisting of the chromosome back into circular shape and is mediated by Topoisomerase I
True
False
Why is the genome size not an indicator of the number of genes
The big size can be due to multiple genes that encode proteins
The big size can be due to accumulation of repetitive sequences
The big size can be due to the size of the organism itself is big
The big size can be due to genotypic variation and environment
In eukaryotic chromosomes, what are required for chromosomal replication and segregation.
Origins of replication
Centromeres
Telomeres
All of the above
What is sequence complexity?
the amount of structural genes found throughout the genome
the number of nonrepetitive sequences throughout the genome
the number of times a particular base sequence appears throughout the genome
the amount of moderately repetitive and highly repetitive sequences that appears throughout the genome
What is the repeating structure unit in a eukaryotic chromosome?
histone
nucleosome
nucleotide
protein
A nucleosome is best described as
nucleosomes coiled around each other
a DNA strand wrapped around histone proteins
one fully-packaged DNA molecule
one strand of DNA double-helix
Which is TRUE concerning the 30nm fiber
is though to be in a solenoid formation
The histone H1 linker is involved in the formation
involves the folding of strands into radial loop domains
connected to a protein scaffold
.... is the fourth level of chromosomal compaction before further compaction into a ....
nucleosome, 30nm fiber
30nm fiber, radial loop domain
radial loop domain, chromatin
chromatin, chromosome
Which of the following is NOT a benefit of DNA packaging?
all of a cell's DNA can fit into the nucleus
DNA is protected from damage
genes can be accessed as-needed
chromosomes can be reshuffled frequently
