Which of the following features is a shared derived trait of the animals?
A. Cells that contain chitin
B. Vascular systems
C. Similarities in their Hox genes
D. Bilateral symmetry
E. Spiral cleavage
Ans: C. Similarities in their Hox genes
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Urea is _____
A) insoluble in water B) more toxic to human cells than ammonia C) the primary nitrogenous waste product of humans D) the primary nitrogenous waste product of most birds E) the primary nitrogenous waste product of most aquatic invertebrates
Salinity within an estuary is greatest in
A) surface water at high tide. B) surface water at low tide. C) deep water at high tide. D) deep water at low tide.
You have identified a bacterial protein that has retained the starting fMet in its protein sequence. Which of the following is likely true of this protein?
A) It is likely nonfunctional, since bacteria use posttranslational cleavage of fMet to make functional proteins. B) It will show improper protein sorting and will likely remain in the ER. C) It will be not be able to be chemically modified, so it will be sent to the Golgi for secretion. D) It will be a functional bacterial protein, since all functional proteins must begin with fMet. E) It will likely form a disulfide bond with a second peptide chain, forming a protein complex.
Mutations in DNA are usually repaired in healthy cells by DNA repair enzymes
Indicate whether the statement is true or false