Human pathogens are generally which type of microbe?
A) mesophiles
B) psychrophiles
C) psychrotrophs
D) thermophiles
Ans: A) mesophiles
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_____, which occurs when two related viruses infect the same host at the same time, can lead to the emergence of new
viral strains. Genetic isolation
a. DNA mutation b. Cell lysis c. Viral reassortment d. Genetic isolation e. Reverse transcription
Why would you predict that the blood carbon dioxide levels in a pregnant woman would fall?
A. The fetus is removing carbon dioxide from her blood. B. She has trouble breathing due to the expanding uterus. C. Pregnancy creates a favorable concentration gradient between the fetal and maternal blood. D. The bronchial tubes relax. E. The maternal oxygen levels are also falling.
Male peacocks having more ornate plumage than their female counterparts is an example of which of the following features of ecological behavior?
a. monogamy b. sexual dimorphism c. sexual selection d. territoriality
Chromosomes that look alike and carry the same sequence of genes for the same traits are
A)the X and Y chromosome. B)all the autosomes. c)homologous chromosomes. d)found in females only. e)found in males only.