42. The stickleback fish that lives in lakes has no pelvic spines because A. It
ID: 257534 • Letter: 4
Question
42. The stickleback fish that lives in lakes has no pelvic spines because A. It deleted the pitl gene that codes for the spines B. It deleted the switch that turns the pitl gene in the pelvic region C. It has a frameshift mutation within the pitxl gene D. The promoter of the pitbd gene was mutated 43. Sticklebacks that live in the ocean have pelvic spines while those that live in lakes do not. What is the best explanation for this? A. Pelvic spines are advantageous in both oceans and lakes B. Pelvic spines help the lack sticklebacks catch their prey (food). C. Pelvic spines are a disadvantage in the lakes because the predators use them to catch the stickeback. D. This is simply a mutation that has no advantage or disadvantage in either environment 44. The primary function of a gene is A. to synthesize mitochondria C. to find the promoter region B. to direct synthesis of proteins D. act as switch for transcription factors WILL NOT be transcribed (will LacZ and LacY be made?) In each senario, decribe whether the lac operon WILL or b. WILL NOT b. WILL NOT b. WILL NOT b. WILL NOT a. WILL 45. Glucose present and lactose are present 46 Glucose, repressor and lactose are all present 47. ONLY repressor and lactose are present 48. ONLY repressor is present a. WILL a. WILL a. WILLExplanation / Answer
ANSWER 42.
B. It deleted the switch that turns the pitx1 gene in the pelvic region
ANSWER 43.
C. Pelvic spines are a disadvantage in the lakes because the predators use the to catch the stickleback.
ANSWER 44.
B. to direct synthesis of proteins
ANSWER 45. WILL NOT - because Glucose is there so activator protein is not bound to DNA
ANSWER 46. WILL NOT - because Glucose is there so activator protein is not bound to DNA
ANSWER 47. WILL - because activator protein is bound due to absence of glucose, and lactose takes away repressor protein.
ANSWER 48. WILL NOT - because Lactose is not there so repressor protein blocks access to RNA Polymerase
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