2 Points
The graph shows the size of the human population from 1800 into the future.
Around 1800, Thomas Malthus predicted that the human population would
soon outstrip its ability to feed itself.
16.000
14.000
UN High
UN
Medium
Millions of people
12.000
$10,000
8,000
6,000
Actual
UN Low
2000 Estimated
Which of the following did Malthus fail to take into consideration?
O
A. Humans could live off less food over time.
O
B. The human population would decrease over time,
O
C. Humans would find more efficient ways of growing crops.
O
D. The human population would become more focused on ideas and
services

You are studying several alleles of an e. coli helicase gene. one allele, called rsr, confers resistance to rs2014, an antibiotic that works by inhibiting helicase activity. bacteria with the rss allele are sensitive to rs2014. another allele, called ts-, produces a temperature sensitive mutation of the helicase. in bacteria with the ts- allele, helicase is inactivated at 42 °c but functions normally at 37 °c. helicase functions normally at both temperatures in bacteria with the ts allele. you obtain the following data while testing four strains of e. coli at different temperatures and doses of rs2014. each number represents the percentage of maximal dna synthesis. based on this data, assign the appropriate genotype to strains a–d in the spaces provided