The key specializations that occurred in the evolution of mammals include all of the following except
A. warm-bloodedness.
B. the presence of a placenta in most.
C. different teeth suited to their diet.
D. digestive tract specialization.
E. reduction in brain size.
E. reduction in brain size.
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A vascular bundle
A. contains xylem and phloem. B. is not found in leaves. C. is usually scattered in the stem of a eudicot. D. is on the outer surface of a root. E. is very distinct in the apical meristem.
How are the five nucleotides similar to each other?
a. All five are composed of a phosphate group, sugar, and a nitrogenous base. b. All five contain the same nitrogenous base. c. All five have the same number of atoms.
Which of the following pairs of terms is mismatched?
A) bacteriostatic — kills vegetative bacterial cells B) germicide — kills microbes C) virucide — inactivates viruses D) sterilant — destroys all living microorganisms E) fungicide — kills yeasts and molds
Which of the following can affect enzyme
activity?
a. temperature change b. pH change c. changes in salt concentrations d. regulatory molecules e. all of these