Which of the following would be an example of mechanical isolation?
A) Male and female genitalia are incompatible.
B) Organisms breed at different times.
C) Mating and courtship displays are different.
D) Sperm cannot survive in the female reproductive tract.
Answer: A
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Arbuscular mycorrhizae are characterized by all of the following features except
A. They are the most common mycorrhizal type. B. Fungal hyphae penetrate plant root cells. C. They are seen in the earliest vascular plant fossils. D. The fungus can associate with several species of plants. E. The fungal component is a glomeromycete.
As a plant embryo grows, different body regions develop shapes and structures that correlate with their function. This process is called
1.dedifferentiation 2.homeosis 3.morphogenesis 4.positional development
All of the following diseases are transmitted by
insects EXCEPT a. malaria b. African Sleeping Sickness c. Bubonic Fever d. AIDS e. Chagas Disease
What is the difference between a stable isotope and a radioisotope?
a. A stable isotope emits light. b. A radioisotope emits radiation. c. A stable isotope emits radiation. d. A stable isotope absorbs radiation. e. A radioisotope has an unequal number of protons and electrons.