Which genus is resident flora of the mouth, large intestine, and, from puberty to menopause, the vagina?
A. Escherichia
B. Mycobacterium
C. Haemophilus
D. Streptococcus
E. Lactobacillus
Answer: E
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What is not an ecological role of mangals? a. They stabilize sediments with their root system
b. They provide detritus for food chains to occur. c. They are direct subjects of herbivory. d. They serve as a nursery and refuge to animals.
Some viruses never use DNA to carry out protein synthesis and have only RNA as their genetic material. This would lend evidence to which theory?
A. endosymbiotic theory of eukaryote evolution B. protein-first hypothesis C. simultaneous evolution of RNA and proteins D. RNA-first hypothesis
During the stage called neurulation, a flexible rod called a ________ forms along the midline of the dorsal surface of the embryo.
A. neural groove B. notochord C. somite D. dorsal nerve cord
Chlamydia trachomatis produces a dormant, resistant stage which is transmitted from one host to another.
Answer the following statement true (T) or false (F)