Down's syndrome in which there is an extra copy of chromosome 21 is an example of _______, while cystic fibrosis with a "T" taking the place of a "C" at nucleotide 1609 on chromosome 7 is an example of _______.
A. Chromosomal aberration; base substitution
B. Chromosomal aberration; base insertion
C. Base insertion; base substitution
D. Base insertion; base insertion
Answer: A. Chromosomal aberration; base substitution
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A sponge body type consisting of one spongocoel having many folds is called:
a. asconoid. b. syconoid. c. leuconoid. d. hexactinellida. e. demospongoid.
When an organism possesses both male and female reproductive systems, this is termed
a. organogenesis. b. parthenogenesis. c. hermaphroditism. d. budding.
Species of Shigella are characteristically non-motile. Based on this information, you can predict that members of the Shigella genus:
What will be an ideal response?
Sponges (phylum: Porifera) are animals that possess feeding cells called collar cells. These cells have a central flagellum surrounded by a collar of microvilli. The collar filters organic matter out of the water column. Which protist shares a more recent common ancestor with the poriferans?
A. Ciliates B. Radiolarians C. Choanoflagellates D. Rhodophyta E. Myxomycota