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WorksheetsDNA & REPLICATION REVIEW - 2024
Total questions: 25
Worksheet time: 2hrs 38mins
What is the shape of DNA as named by Watson and Crick?
Double helix
Triple helix
Single strand
Double circle
DNA is found in ___ living things from ___ to humans.
ALL, bacteria
SOME, plants
NO, viruses
FEW, animals
In a prokaryotic cell, DNA is found in the (a) and in a eukaryotic cell, DNA is found in the (b) .
What biomolecule is DNA?
Nucleic acid
Protein
Carbohydrate
Lipid
What are the monomers/building blocks of DNA?
nucleotides
amino acids
fatty acids
monosaccharides
Label the parts of the nucleotide
Phosphate
Which part of the nucleotide holds the genetic information & codes for traits?
#1 - phosphate
#2 - base (ATCG)
#3 - sugar (deoxyribose)
What is the complementary strand to the DNA strand shown below? ATTGCCCAT
TAACGGGTA
CGGTAACGT
GCCATTGCA
TTACGGGAT
How are genetic instructions for traits and proteins coded for in DNA?
in the sequence (order) of nitrogenous base pairs
in the shape of the DNA molecule
in the number of chromosomes
in the type of sugar in the DNA backbone
What 2 components (parts) make up the backbone (sides) of the DNA ladder (Choose 2 answers)?
sugar (deoxyribose),
adenine
cytosine
phosphate
guanine
What 1 component (part) makes up the middle of the DNA ladder?
base (A, T, C, G)
sugar (deoxyribose)
hydrogen bonds
phosphate
The two strands of DNA are held together in the middle by what type of weak bonds – give the name of the bond?
hydrogen bonds
ionic bonds
covalent bonds
The 2 sides of the DNA ladder run in the same OR opposite direction?
opposite (antiparallel)
same (parallel)
perpendicular
random
Label the components (parts) of the DNA molecule.
Fill in the boxes with the correct percentages.
Why is it important for DNA to replicate?
To make sure all cells have different DNA since each cell has a unique function.
To help the cell grow by increasing the number of copies of DNA.
To ensure that when new cells are produced each receives an exact copy of the DNA.
Define Replication.
copying of DNA
transcription of RNA
translation of proteins
mutation of genes
Put the 3 steps of replication in the correct order.
DNA unwinds & unzips when an enzyme breaks the weak hydrogen bonds between the base pairs.
DNA strand pulls apart and free DNA nucleotides begin to pair up with their complementary nucleotides on the parent (template) strand with the help of an enzyme.
The free DNA nucleotides continue to pair up until the entire double strand of DNA has been copied.
Why is it so easy for the bases in the middle of the DNA ladder to separate so easily during replication?
the hydrogen bonds are weak
the covalent bonds are strong
the DNA backbone is unstable
the bases are hydrophobic
In Step #2 of replication, the parent strand serves as a ___ for adding new bases with the help of an enzyme.
template
catalyst
substrate
inhibitor
Are enzymes important in the process of replication?
yes
no
What biomolecule are enzymes?
Proteins
Carbohydrates
Lipids
Nucleic acids
After DNA replication, are the two double helix strands produced identical or not identical?
identical
not identical
All organisms have the same bases (A, T, G & C) but different amounts and __________ of the bases which is what makes each organism unique.
sequences (orders)
structures
parts
Do your heart and muscle cells have the same DNA? (a)
What process allows your heart and muscles cells have different functions? (b)
no
