The mutated gene that causes cystic fibrosis is ____
a. CFTR
b. CRFT
c. CTFR
d. CRTF
e. CFRT
ANSWER: a
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A horseshoe-shaped crown of tentacles used by many invertebrates for feeding is called a
A. protostome. B. fimbrium. C. lophophore. D. trochophore. E. rhizophore.
Which of the following lists the correct order of tracheal system structures, from most external to most
internal?
a. spiracles, tracheae, tracheal branches, tracheoles b. tracheoles, tracheae, tracheal branches, spiracles c. tracheoles, tracheal branches, tracheae, spiracles d. spiracles, tracheal branches, tracheae, tracheoles e. spiracles, tracheoles, tracheae, tracheal branches
How big are most cells?
a. 10-20 nanometers b. 10-20 micrometers c. 10-20 millimeters d. 10-20 centimeters e. 10-20 meters
The genetically identical organisms that result from asexual reproduction are called
A) clones. B) seeds. C) seedlings.