Herpes is caused by a
A) bacterium. B) prion. C) virus. D) viroid. E) fungus.
C
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Which of the following statements accurately describes the role of insects in early angiosperm evolution?
A. Insect pollination may have allowed early angiosperms to thrive in the understory habitats of tropical rain forests. B. Insect pollination may have allowed early angiosperms to thrive in the canopy of tropical rain forests. C. Mammal pollination may have contributed to early angiosperm success. D. Very few living members of the earliest angiosperm lineages produce flowers that are visited by insects. E. Insects did not play a significant role in early angiosperm evolution.
What were the genotypes / phenotypes in the Parental generation?
An experimenter crosses two fruit flies with different phenotypes. The results in the F2 generation are: 478 crooked legs, trembling behavior 372 stumpy legs, circling behavior 175 crooked legs, circling behavior 98 stumpy legs, trembling behavior A. Both parents homozygous / Female phenotype: crooked legs, trembling, Male phenotype: stumpy legs, circling B. Both parents homozygous / Male phenotype: crooked legs trembling, Female phenotype: stumpy legs, circling C. Both parents heterozygous / Female phenotype: crooked legs, trembling, Male phenotype: crooked legs, trembling D. Both parents homozygous / Male or female parental phenotype: crooked legs, trembling, Second parental phenotype: stumpy legs, circling E. Both parents heterozygous / Both parental phenotypes: crooked legs, trembling
Type I topoisomerases differ from type II topoisomerases in that the type I enzymes ________
A) decrease the linking number (L) of a double helix B) ligate fragments of DNA that have been hydrolyzed C) cleave both strands of a double helix D) induce negative supercoiling E) cleave one strand of a double helix
________ defines the lowest quantity of an antigen that can be detected in a serological test
A) Specificity B) Antigenic capacity C) Minimal inhibitory concentration D) Sensitivity