What is the best explanation for the observation that eukaryotes that seem superficially simple can have much larger genomes (in terms of mass or number of base pairs) than organisms that have complex anatomy, structure, or behavior?
A. Animals with simple body plans are adapted for rapid DNA replication.
B. Some organisms have a tremendous amount of noncoding DNA, like repetitive sequences.
C. Alternative splicing and overlapping genes are rampant among eukaryotes.
D. Simpler organisms require more chemical defenses against enemies.
E. DNA in the mitochondria and chloroplasts are not counted in these measurements of genome size.
Answer: B. Some organisms have a tremendous amount of noncoding DNA, like repetitive sequences.
You might also like to view...
Membranes of some thermophilic Archaea are stabilized by ether linked phospholipids.
Answer the following statement true (T) or false (F)
Outbreaks of which protozoan disease have been associated with fecal-contaminated imported raspberries, fresh greens, and drinking water?
A. Cryptosporidiosis B. Toxoplasmosis C. Trichinosis D. Cyclosporiasis
An organism has been found to contain a defective form of photolyase. What function might be impaired in this organism?
A. Recognition of damaged DNA by the UvrABC complex B. Repair of DNA damage caused by UV light C. Stabilization of single-stranded DNA during DNA replication D. Lengthening of the tips of chromosomes
During chemiosmosis, electrons are pumped across a membrane to produce ATP.
Answer the following statement true (T) or false (F)