Down syndrome is associated with which of the following karyotypes?
a. 47, XXY
b. 47, XXX
c. 46, XY
d. 47, XY, trisomy 21
Ans: d. 47, XY, trisomy 21
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What group of fungi has the ability to penetrate its host's cell wall, thus increasing the efficiency with which materials are passed from fungus to host?
A) ectomycorrhizal fungi B) arbuscular mycorrhizal fungi C) endophytes D) lichens
In vertebrates, the neurotransmitter acetylcholine ____
a. can act as a direct neurotransmitter between neurons and muscle cells b. is involved in memory and learning c. can be released into the circulation and act as a hormone d. can act as a pain reducer and initiate euphoria e. is involved in pain perception
The pharynx opens into both the trachea and _________
Fill in the blank(s) with the appropriate word.
Which group of genes in Drosophila embryos must be mutated if the result is elimination of a significantly sized, contiguous region of segmentation?
What will be an ideal response?