What is the most compelling reason why "protists" are not considered to be a taxonomic group?
A. The group includes both prokaryotic and eukaryotic cell types.
B. The organisms often included in this group are very diverse and don't form a cohesive taxon.
C. They are not cellular life forms.
D. They are too small to be included among the eukaryotes.
Answer: B
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The most common source(s) of infection in the central nervous system (CNS) is(are):
a. hematogenous spread. b. infections at other sites such as otitis me-dia. c. organisms gaining access because of ana-tomic defects in CNS structures. d. bacteria that are able to travel along nerves leading to the brain.
Answer the following statements true (T) or false (F)
1. Plant behavior is defined as response to stimuli. 2. Brassinosteroids produced by plants are closely related chemically to animal steroid hormones. 3. One reason auxins are called the "master plant hormones" is because they mostly work apart from other hormones. 4. One reason magnesium is important to plants is that it is part of the chlorophyll molecule.
The site of new primary growth at the apex of a shoot is the
a. terminal bud. b. internode. c. axil. d. lateral bud. e. node.
There are individuals who are missing one of their sex chromosomes and are designated as XO individuals. These individuals
A. develop as males. B. develop as females. C. are unusually tall. D. are easily recognizable.