Hornworts differ from mosses and liverworts in containing
A. spores.
B. gametophytes.
C. sporophytes.
D. photosynthetic sporophytes.
E. small leaves.
Answer: D
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Finally, you take a tree and block the ants from the canopy. Then you spend three years counting the number and types of insects on the forest floor around this tree (tree A) and in the area around a tree in which ants are not blocked (tree B)
You find that the area around tree A has 25% fewer ants and 40% more beetles than the area around tree B. These data support the hypothesis that: A. there is no relationship between ant abundance and beetle abundance. B. there is a positive relationship between ant abundance and beetle abundance. C. there is a negative relationship between ant abundance and beetle abundance. D. ecological interactions in the tree canopy have no effect on forest floor communities. E. ecological interactions in the tree canopy always have a negative effect on forest floor communities.
Examine the pedigree in the figure above. Individuals affected by the genetic condition in question are indicated by
filled squares or circles. Which inheritance pattern is most likely correct for this condition in this family?
a. autosomal dominant b. X-linked recessive c. X-linked dominant d. cytoplasmic inheritance e. autosomal recessive
Drosophila fruit flies, like mammals, have an X-Y sex-determination system. The insect differs from the mammalian system in an important respect, however. What is it?
What will be an ideal response?
Your brain is a structure composed of different kinds of tissue. What is this kind of structure called?
a) organ system b) cell c) tissue d) organ