In the fetal circulation, blood from the ________ flows directly into the descending aorta.
A. ligamentum arteriosum
B. ductus arteriosus
C. foramen ovale
D. ductus venosus
Answer: B
Anatomy & Physiology
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Any given protein contains binding sites for only one kind of ligand.
Answer the following statement true (T) or false (F)
Anatomy & Physiology
Air enters the tracheae of insects through the
A) Spiracles. B) Ostia. C) Madreporite. D) Buccal cavity.
Anatomy & Physiology
One gram of carbohydrate, one gram of lipid, and one gram of protein yield ________, ________, and ________ kilocalories respectively.
A. 4, 9, 9 B. 4, 4, 4 C. 9, 9, 9 D. 9, 9, 4 E. 4, 9, 4
Anatomy & Physiology
A DNA nucleotide sequence that signals the beginning of a gene is called a ________.
A. RNA polymerase B. triplet C. promoter D. transcription factor E. terminator
Anatomy & Physiology