Which of the following hormones regulates metamorphosis and molting in insects?  

A.  melatonin
B.  ecdysone
C.  estrogen
D.  somatostatin
E.  trypsin


B.  ecdysone

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

Division and differentiation of ground meristem gives rise to ____.

A. ground tissue B. vascular tissue C. dermal tissue D. protoderm E. procambium

Biology & Microbiology