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WorksheetsRC 2-Pre-Assessment
Total questions: 10
Worksheet time: 20mins
Characteristics such as a widow’s peak or attached earlobes are determined by the genetic code. Which components of DNA are referred to as the genetic code?
phosphate groups
nitrogenous bases
deoxyribose sugars
hydrogen bonds
Each strand of a DNA molecule contains nitrogenous bases that pair with other nitrogenous bases in very specific ways. A diagram of a section of DNA is shown. Which DNA strand is complementary to the one shown above?
The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans —
depend on the same food supply
share a genetic code
both have eukaryotic cells
have identical genomes
In the early 1980s scientists were able to produce two biomolecules by splicing a human gene into the bacterium E. coli to make recombinant human insulin and growth hormone. Which statement best explains why this experiment was successful?
Human cells are eukaryotic, and E. coli cells are prokaryotic.
All living organisms share the same genome.
The genes for all organisms are composed of the same building blocks.
The human body contains many types of bacteria, including E. coli.
The arctic fox inhabits northern areas of North America. The same arctic fox is shown in the drawing at different times of the year. What causes this change in fur color?
The alleles for fur color change as the arctic fox grows older.
Gene expression for fur color is regulated by latitude.
The arctic fox has two traits for fur color that are determined at birth.
Gene expression for fur color is regulated by temperature.
Which of these is the direct result of an error in the transcription of a DNA nucleotide?
The nuclear membrane is ruptured.
Amino acids do not bond to tRNA
A codon sequence is incorrect.
Transportation of mRNA does not occur.
Crossing-over between nonsister chromatids during meiosis is significant in heredity. This process most likely leads to an increase in which of the following?
The expression of dominant traits
Number of gametes
The occurrence of polyploidy
Genetic variation
Human body cells each have 46 chromosomes in their nuclei. Meiosis is necessary in order to ensure that each gamete produced in the human body has —
12 chromosomes
23 chromosomes
46 chromosomes
92 chromosomes
During meiosis, homologous chromosomes exchange genetic material. This exchange of genetic material —
increases the genetic variation
reduces the diploid number to the haploid number
increases the haploid number to the diploid number
reduces the probability of mutations
In the early 1900s, Thomas Hunt Morgan was among the first scientists to contribute to the chromosome theory of heredity. Morgan’s investigations into heredity in fruit flies led him to propose that the event represented in the diagram sometimes occurs. Which statement about the event represented in the diagram is valid?
The event represents RNA translation in the smooth endoplasmic reticulum.
The event takes place in bacterial cells.
The event produces genetically identical daughter cells.
The event provides genetic diversity in eukaryotic cells.
