As oomycetes infected and killed potato plants during the Irish Potato Famine, oomycetes can be classified as a(n) _________________. Select all correct choices
A. virulent pathogen
B. biotrophic pathogen
C. avirulent pathogen
D. necrotrophic pathogen
A,D
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Which of the following is not a characteristic of DNA?
A) complementarity B) composed of nucleotides C) contains ribose D) antiparallel strands E) double-stranded
The plague bacillus is known as
A. Plasmodium vivax. B. Pneumocystis carinii. C. Streptococcus pyogenes. D. Yersinia pestis.
How does gibberellic acid affect stem length in pea plants?
a. Plants with normal stem length have higher levels of gibberellic acid. b. Plants with short stem length have higher levels of gibberellic acid. c. Plants with normal stem length have the dominant allele Le that encodes an enzyme to degrade gibberellic acid. d. Plants with short stem length have the dominant allele Le that encodes an enzyme to degrade gibberellic acid. e. Plants with short stem length are homozygous recessive for the allele le that encodes an enzyme to degrade gibberellic acid.
What is the "psychological need" that many humans have for nature?
A) mutualism B) commensalism C) community D) biophilia