Answer the following statements true (T) or false (F)
1. Homologous chromosomes are identical copies of each other.
2. Mitotic cell division is never used by organisms as a means of reproduction.
3. A diploid queen honeybee produce eggs by meiosis. Some of these eggs are never fertilized, while the rest are. These unfertilized eggs develop into haploid male honeybee. This can be an example of sexual reproduction.
4. For any given species, cells in metaphase II of meiosis would contain 2? more genetic material than cells in metaphase of mitosis.
5. The karyotype of a normal human male would show a total of 23 pairs of homologous chromosomes.
1. FALSE
2. FALSE
3. TRUE
4. FALSE
5.. FALSE
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Cadherins (select all correct choices):
A. are cell adhesion molecules found in cellular junctions at cell surfaces. B. are calcium-dependent proteins involved in attachment of cells to neighboring cells. C. are calcium-dependent proteins involved in attachment of cells to the extracellular matrix. D. are highly diverse, and each type can only bind to a complementary cadherin type.
Answer the following statements true (T) or false (F)
1. In the organismic model, communities are superorganisms. 2. A forest community consists of not only the trees and shrubs, but also the animals and microorganisms. 3. If one species in a community is very common this will increase measures species diversity. 4. The time hypothesis suggests communities diversify with age. 5. South Texas has the highest bird species richness in the continental United States.
The actions of insulin and glucagon are
a. synergistic. b. antagonistic. c. cooperative. d. permissive. e. mutualistic.
According to the IUCN Red List, what group of living organisms is most greatly threatened by extinction?
A. coral reefs B. birds C. conifers D. amphibians E. mammals