Which of the following hormones regulates metamorphosis and molting in insects?
A. melatonin
B. ecdysone
C. estrogen
D. somatostatin
E. trypsin
B. ecdysone
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Which of the following transcription factors is present at the highest concentration in the eve stripe 2 region of the fruit fly?
A. bicoid B. Hunchback C. Krüppel D. Giant
Epiglottitis is a potentially life-threatening disease because the patient's airway can become completely obstructed (blocked) if not treated. Which bacterium usually causes this disease?
a. Haemophilus influenzae type B b. Corynebacterium diphtheriae c. Streptococcus pyogenes d. Type A influenza virus
Diffusion of respiratory gases is enhanced by ____
a. a large surface area b. a thick epithelial layer c. cool temperatures d. the presence of active transport pumps e. the presence of carbon dioxide
Division and differentiation of ground meristem gives rise to ____.
A. ground tissue B. vascular tissue C. dermal tissue D. protoderm E. procambium