Tiktaalik roseae, also known as the "fishapod," is an example of an extant species.
Answer the following statement true (T) or false (F)
False
Tiktaalik roseae exists only in the fossil record. It is an extinct species. Extant is a term that applies to species that are still in existence.
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The point of constriction on chromosomes that contains certain repeated DNA sequences that bind specific proteins is called:
A. The kinetochore B. The centromere C. The cohesin complex D. The centriole E. The centrosome
Class I MHC proteins have grooves with open ends
Indicate whether the statement is true or false.
All of the following events occur during T-dependent activation of a B cell EXCEPT
A. an antigenic fragment held within an MCH Class II molecule of a dendritic cell binds to a specific T cell receptor on a naïve T-helper cell. B. specific cytokines from the T helper cells stimulate maturation and complete activation of the antigen-stimulated B cell. C. antigen within MCH class II molecule is presented by B cell to an activated T helper cell. D. antigen binds to specific B cell receptor molecules. E. antigen bound to the B cell receptor is internalized and transferred to an MHC class II molecule which then moves to the plasma membrane. F. There are no exceptions. All of these events occur during T-depedent activation of B cells.
Which substance is not released by plant roots to enable and improve access to particular nutrients in the soil?
a. amino acids b. carbohydrates c. enzymes d. fatty acids e. carbon dioxide