In the lac operon, the product of structural gene lacZ is capable of ________
A) forming ATP from pyruvate
B) forming lactose from two glucose molecules
C) splitting the ?-linkage of lactose
D) nonautonomous replication
E) replacing hexokinase in the early steps of glycolysis
C
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Two dihybrid pea plants (both tall and with purple flowers) are mated. The cross resulted in 9866 progeny, of which 5550 were tall with purple flowers. What are the expected ratios of the other phenotypic classes?
A. 1850 Short/white flower 616 Tall/white flower 1850 Short/purple flower B. 1850 Short/white flower 1850 Tall/white flower 1850 Short/purple flower C. 616 Short/white flower 1850 Tall/white flower 1850 Short/purple flower D. 5550 Short/white flower 5550 Tall/white flower 5550 Short/purple flower
The Hawaiian Islands have formed as the result of ________
a. hot spots forming b. faults forming c. oceanic ridges forming d. ocean trenches forming e. boundaries forming
Select the hormone that is NOT involved in crustacean molting
a. molt-inhibiting hormone b. juvenile hormone c. brain hormone d. ecdysone e. molt-stimulating hormone
The renal pelvis is continuous with the
A. nephrons. B. ureter. C. bladder. D. urethra. E. renal cortex.