生物問題請教

[bluemagpie (貞心相廷)]

1.Starting from a single individual, what is the size of a population of
bacteria that
reproduce by binary fission every 20 minutes at the end of a 2 -hour time
period?
(Assume unlimited resources and no mortality.)
A) 6
B) 18
C) 128
D) 512
E) 1,024
Answer: D
這題我算不出來D這答案
2.To measure the population of lake trout in a 250-hectare lake, 400 individual
trout were
netted and marked with a fin clip, then returned to the lake. The next week,
the lake was
netted again, and out of the 200 lake trout that were caught, 50 had fin
clips. Using the
capture-recapture estimate, the lake trout population size could be closest
to which of
the following?
A) 160
B) 200
C) 400
D) 1,600
E) 80,000
Answer: D
這題我算不出來D這答案
煩請各位高手幫忙解答
謝謝

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◆ From: 122.118.177.58
→ smc0911:第二題...應該不難吧....
→ smc0911:200 / 5 = 4 ....400 X 4 = 1600
→ smc0911:200 / 50 = 4.....寫錯
推 frankwu0507:第一題應該是三小時吧 第二提 400 : X = 50 : 200
→ jgtc:兩小時應該得不到吧?
→ smc0911:贊成..frankwu0507說的3小時....