The genetic information in DNA is divided into units called ________.
A. phenotype
B. genes
C. proteins
D. genotype
Answer: B
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How many transmembrane domains are present in a G-protein-coupled receptor?
a. one b. three c. five d. seven e. nine
Why does vascular cambium produce annual rings in xylem but not in phloem? What will be an ideal response?
The single ventricle in an amphibian heart means the oxygenated and deoxygenated blood mix. How do amphibians manage to survive despite this inefficiency?
A. They transport oxygen across the skin. B. They keep their body temperatures high. C. The absorb large amounts of fluid. D. They keep gills into adulthood. E. They move very slowly.
Which statement about fruit fly development is false?
A) One of the earliest development events is the determination of the head and tail ends of the egg. B) The location of the head and tail ends of the egg is primarily determined by the location of sperm entry during fertilization. C) Homeotic genes regulate batteries of other genes that direct the anatomical identity of body parts. D) Cascades of gene expression routinely direct fruit fly development.