Challenge 1
Check genome composition
Use the cytosine percentage and complementary base pairing to calculate the adenine percentage.
Application library0/4 attempted
B.7A·Biology·DNA & Protein Synthesis
DNA Structure in the real world
Identify components of DNA and explain how the nucleotide sequence specifies some traits of an organism.
Transfer evidence, not just familiar practice
Correctly solve different fresh variations at least 24 hours after your first correct transfer response. Reviewing the same challenge again does not count as fresh retention evidence.
You can explore every situation now. Practice unlocks after you retain B.5A.
Career · Genomics and forensic science
Genomics comparison lab
A genomics team verifies base composition in a newly sequenced organism and compares the same DNA region across species to investigate relatedness.
Why this TEKS matters
Base-pairing rules constrain DNA composition, while nucleotide differences provide evidence that must be interpreted without claiming more than the data show.
Challenge 2
Compare species' DNA
Infer which species comparison shows fewer differences and state only the relationship the evidence supports.
Everyday life · Gardening and science news
Plant color and synthetic DNA
Two garden plants have different versions of a pigment-enzyme gene, and a science article describes researchers assembling a synthetic nucleotide.
Why this TEKS matters
DNA sequence can influence traits through proteins, and nucleotide components determine how genetic information can be built and read.
Challenge 3
Connect sequence to flower color
Explain how different nucleotide sequences could change the pigment enzyme and the visible trait.
Challenge 4
Evaluate a synthetic nucleotide
Predict the most direct consequence of attaching a new base to a sugar and phosphate.