Peptide bonds only exist between proteins, everything else is a hydrogen bond
a. true
b. false
Answer: a. true
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During the end-Permian mass extinction:
A. oxygen levels in the deep oceans dropped. B. global warming occurred as a result of volcanic eruptions. C. oceans were acidified as a result of volcanic eruptions. D. oxygen levels in the deep oceans dropped and oceans were acidified as a result of volcanic eruptions. E. all of the answer options are correct.
Fibroblasts are present in which tissue type?
a. connective tissue b. epithelium c. muscle d. nervous tissue e. all tissue types
Transposase is
A) required to resolve a Holliday junction. B) involved in the movement of mobile genetic elements in prokaryotic and eukaryotic genomes. C) found only in prokaryotic transposons. D) required for synthesis-dependent strand annealing to repair double-stranded DNA breaks. E) necessary for replicative transposition but not conservative transposition.
Which of the following clades has been proposed by plant biologists as the clade that defines the plant kingdom?
a. Plantae, Streptophyta, and Viridiplantae have all been proposed as the clade that defines the plant kingdom. b. Kingdom Plantae, which includes only the embryophyte clade c. Kingdom Streptophyta, which also includes the charophytes d. Kingdom Viridiplantae, which also includes all green algae (chlorophytes) e. Kingdom Vasculata, which includes the vascular plants