Which bacterial groups typically colonize the newborn within the first 12 hours of birth?
What will be an ideal response?
Prevotella, Lactobacilli, Sneathia
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Which of the following statements about communication in the White-Crowned Sparrow is not correct?
A. The White-Crowned Sparrow's song is an advertisement display behavior. B. The White-Crowned Sparrow's song is learned by imprinting, a sensitive period that takes place about 10–50 days after hatching. C. During the learning phase, the White- Crowned Sparrow's subsong is a sequence of unstructured twittering. D. If a tape of another species song, for example the Swamp Sparrow, is played during the sensitive period, the White- Crowned male will learn that song. E. If deprived of hearing the adult male's song during the early sensitive period, the bird will continue to sing an unstructured twittering throughout its life.
A proficient engineer can easily design skeletal structures that are more functional than those currently found in the forelimbs of such diverse mammals as horses, whales, and bats. The actual forelimbs of these mammals do not seem to be optimally arrange
d because _____. A) natural selection has not had sufficient time to create the optimal design in each case, but will do so given enough time B) in many cases, phenotype is determined by genotype and the environment C) though we may not consider the fit between the current skeletal arrangements and their functions excellent, we should not doubt that natural selection ultimately produces the best design D) natural selection is generally limited to modifying structures that were present in previous generations and in previous species
Both the phosphorylation of intermediates and the formation of ATP in glycolysis are examples of
A) substrate-level phosphorylation. B) product-level phosphorylation. C) oxidative phosphorylation. D) anabolic phosphorylation. E) aerobic phosphorylation.
Which type of RNA shows enzymatic activity by catalyzing a peptide bond formation between amino acids?
a. mRNA b. tRNA c. rRNA d. all types of RNA e. no RNA shows enzymatic activity