Pepsinogen is converted to pepsin by the presence of what other substance?
A) intrinsic factor
B) vitamin B12
C) mucus
D) HCl
D
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Which of the following is NOT a principle used when analyzing cladograms?
A. All species, or higher taxa, are placed on tips in a phylogenetic tree. B. All species, or higher taxa, are placed on nodes in a phylogenetic tree. C. Each cladogram branch point should have one or more shared derived characters that are common to all species above the branch point, unless the character is later modified. D. All shared derived characters appear together only once in a cladogram unless they arose independently during evolution more than once. E. All species, or higher taxa, are placed on tips in a phylogenetic tree and all shared derived characters appear together only once in a cladogram unless they arose independently during evolution more than once.
Koopman’s research on mouse meiosis revealed ____
a. a meiosis promoting gene b. a meiosis inhibiting gene promotes retinoic acid production c. that retinoic acid prevents meiosis d. Cyp26b1 gene expression in embryonic testes but not ovaries e. germ cells form later in male mice that lack the Cyp25b1 gene
The most common causative agent of urinary tract infections is ________.
A. Staphylococcus aureus B. Streptococcus pyogenes C. Pseudomonas aeurginosa D. Escherichia coli
What differences do you observe between the Rhizopus zygotes and Rhizopus sporangia?
What will be an ideal response?