The vegetative stage of a protozoan is called a (cyst/trophozoite/zygote)
What will be an ideal response?
trophozoite
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In a ________ assay, DNA extracted from a microbial community or environmental sample is incubated with selected complementary probe or sample sequences (often ________) and allowed to hybridize. The level of hybridization to each probe (gene) is measured. Analysis of DNA hybridization thus reveals the presence or absence of the specific genes in the environment. Most importantly, this can be done without ________.
What will be an ideal response?
The cells that line your small intestine absorb nutrients. Their cell membranes consist of many extensions and folds that project into the open space of the intestine. Why is this cell structure advantageous in the small intestine?
What will be an ideal response?
The ________ detect movement of the head
A) semicircular canals of the inner ear B) bones in the middle ear C) pinna and auditory canal of the outer ear D) oval and round windows of the inner ear E) olfactory receptors in the nasal cavity
Antigen exposure is necessary to stimulate B cells to
a. produce soluble antibodies. b. differentiate to plasma cells. c. induce genetic hypermutation in B cells. d. do all of the above.