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WorksheetsExploring Genetics and Molecular Biology
Total questions: 17
Worksheet time: 11mins
What is the purpose of gel electrophoresis in molecular biology?
To increase the size of DNA fragments
To separate DNA fragments based on their size
To create DNA fragments
To visualize proteins only
Phosphates have a negative charge. Which part of the DNA molecule causes it to move towards the positive electrode during gel electrophoresis?
Phosphate backbone
Deoxyribose sugar
Nitrogenous bases
Hydrogen bonds
What is a taster gene?
A gene that determines an individual's preference for sweet tastes
A gene that is responsible for the ability to taste certain bitter compounds
A gene that enhances the taste of salty foods
A gene that suppresses the sense of taste
What is a nontaster allele?
An allele that increases sensitivity to bitter tastes
An allele that has no effect on taste
An allele associated with the inability to taste certain bitter compounds
An allele that makes all foods taste sweet
During gel electrophoresis, why do smaller DNA fragments move faster than larger ones?
Smaller fragments are negatively charged
Smaller fragments are positively charged
Smaller fragments encounter less resistance in the gel matrix
Larger fragments are attracted to the negative electrode
What is the main reason DNA molecules move through the gel during electrophoresis?
Gravity
Magnetic field
Electric current
Thermal convection
What does a pedigree chart show?
The evolutionary history of a species
The life cycle of an organism
The inheritance of a trait through several generations
The genetic diversity within a population
In a pedigree chart, what does a square typically represent?
A female individual
A male individual
A marriage or mating
An offspring
Why are DNA fragments negatively charged, allowing them to move towards the positive electrode during electrophoresis?
Because of the negative charge of the nitrogenous bases
Because of the negative charge of the phosphate groups in the DNA backbone
Because of the negative charge of the deoxyribose sugars
Because DNA is coated with a negative dye
Match what the DNA bands stand for with the correct individual(s).
Heterozygous (Tt) taster
Mom, Dad, Brother 1
Homozygous dominant (TT) taster
Grandpa, Brother 2
Homozygous recessive (tt) nontaster
Jillian
Label the the bands correctly.
D
B2
G
M
J
B1
What does a circle typically represent in a pedigree chart?
A male individual
A female individual
An offspring
A marriage or mating
What is the role of the buffer solution in gel electrophoresis?
To provide a medium for DNA fragments to move
To color the DNA fragments
To break down the DNA fragments
To make the DNA fragments positively charged
What is a supertaster?
An individual with a heightened sensitivity to all tastes
An individual with no sense of taste
An individual who can taste only bitter compounds
An individual who can taste only sweet compounds
What are some uses of DNA fingerprinting?
What is the likelihood of a non-taster to have non-taster children if they have children with one heterozygous for taste?
How many generations were in the pedigree chart for Jillian's family?
1
2
3
4
