Some sponges are green because they
A. Are more like plants than animals
B. Filter algae out of the water for food
C. Have photosynthetic organisms in their tissues
D. Are primary predators
Answer: C. Have photosynthetic organisms in their tissues
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A change in behavior related to a stimulus and response is
A. aversiveness. B. associative learning. C. habituation. D. orientation. E. aversiveness and habituation.
DNA replication of linear chromosomes has multiple sites known as ________.
Fill in the blank(s) with the appropriate word(s).
In Drosophila melanogaster, the gene for eye color is located on the X chromosome. The allele for red eye color
(Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You find only red-eyed females and red-eyed males present. Flies from the vial were allowed to interbreed, and in the next generation you find only red-eyed females, but you find both red-eyed and white-eyed males. The genotypes of the original parents were ____.
a. Xw+Xw+; XwY b. Xw+Xw; XwY c. XwXw; Xw+Y d. Xw+Xw; Xw+Y e. XwXw; XwY
Chromosomes are visible only
a. as chromatin. b. during cell division. c. in eukaryotic cells. d. within the nucleolus. e. through the use of transmission electron microscopy.