WorksheetsLife Science- Ch 7: DNA and Modern Genetics
Total questions: 23
Worksheet time: 23mins
Which scientist used X-rays to help reveal DNA's shape, leading to the discovery of its spiral structure?
Erwin Chargaff
Rosalind Franklin
James Watson only
A group of ribosomes
What two components form the sides (backbone) of the DNA ladder in the double helix?
Adenine and thymine
Sugars and proteins
Deoxyribose sugar and phosphates
Cytosine and guanine
In DNA’s double helix, what forms the rungs of the ladder?
Nitrogen bases connected by base pairing
Sugars and phosphates only
Amino acids linked by peptide bonds
Ribosomal proteins
Why does DNA replication occur before a cell divides?
To make copies of RNA for protein synthesis
To ensure each new cell receives a complete copy of DNA
To remove mutations from the DNA sequence
To change the organism’s traits immediately
What can happen when random DNA damage is not corrected by the cell?
It becomes part of the genetic code and can be inherited as a genetic disorder
It immediately turns into RNA and is harmless
It always causes the cell to die instantly
It creates extra ribosomes that fix the gene
During translation, what role does tRNA play?
It codes for and delivers the amino acid that was specified by mRNA
It copies DNA into RNA
It opens the DNA at the gene
It releases mRNA from the nucleus
What happens as a result of translation according to the lesson?
Amino acids join together to make a protein
DNA closes and mRNA is released
An extra chromosome forms
Mutagens are removed from the cell
Which option describes artificial selection as presented in the lesson?
Human practice of breeding animals and plants to have certain traits
A natural transfer of genes between species
The use of ribosomes to assemble proteins
Chemical damage to DNA by mutagens
Cloning is a type of biotechnology. Which of these choices is an example of cloning?
Certain chickens are bred for their distinctive feather color
Several copies of a fruit fly gene are produced in a laboratory
Plants with red flowers are bred with plants with blue flowers
Yeast cells are placed under an ultraviolet light, causing their DNA to mutate
Which was most likely the first biotechnology that was studied by human
Finding evidence of crime
making new medicines to cure sicknesses
discovering the causes of hereditary diseases
breeding better varieties of crops
Describe the shape of DNA as discovered by Watson and Crick.
straight
single stranded
double helix
round
What nitrogenous base is only present in RNA?
(a)
What type of mutation is demonstrated in the picture?
(a)
Vocabulary:
the material that determines the inherited characteristics in all living things
(a)
Vocabulary:
the process in which the genome of a living cell is modified for medical or industrial use.
(a)
Vocabulary:
the compounds which make up DNA, they consist of a sugar, a phosphate, and a nitrogen base.
(a)
Vocabulary:
A mutation that adds an extra base on a piece of DNA
(a)
Vocabulary:
a genetic duplicate of a specimen
(a)
The following sequence of letters represent the order of bases in a single strand of DNA.
Complete the complementary strand:
C T T A G G C T T A C C A
(a)
Free Response (please write complete sentences):
Chargaff’s rule tells us that a nitrogenous base will only link with its complementary base pair. What are those pairings in DNA?
Free Response (Please write complete sentences):
Describe the major steps of gene transcription and translation.
Free Response (please write complete sentences):
What is a mutagen and give an example.
