Ectodermal cells that form at the tip of the neural tube move outward to positions throughout the body. The descendants of these cells include the neurons of the peripheral nervous system. This movement of cells is an example of ____
a. differentiation
b. cleavage
c. embryonic induction
d. apoptosis
e. cell migration
e
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Refer to the paragraph on the orangutan breeding program. Which of the following hormones would you use if you want to induce ovulation in a few days?
A) estradiol (estrogen) B) progesterone C) luteinizing hormone (LH) D) human chorionic gonadotropin (hCG)
In which of the following situations is genetic drift likely to occur?
A. A small population of lizards is isolated on a small island. B. A mouse develops a fur coat that enables it to hide more readily from predators. C. Two schools of tuna merge together to form one large population. D. A river changes course, changing the local environment for a population of butterflies.
A flower with petals, sepals, and one carpel but no stamens is ____
a. perfect and incomplete b. imperfect and complete c. imperfect and incomplete d. perfect and complete e. sterile
About 80% of all land plants, including grasses, shrubs, and trees, form mycorrhizae. Mycorrrhizae are which of the following?
A. associations between fungi and plant leaves B. associations between fungi and plant roots C. associations between bacteria and plant leaves D. associations between bacteria and plant roots E. associations between bacteria and fungi