Which of the following are not included among the eumetazoans that have true tissues?
A) sea stars (Echinodermata)
B) earthworms (Annelida)
C) sea anemones (Cnidaria)
D) sponges (Porifera)
Answer: D
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Leptin is a product of
A. the brain. B. adipose tissue. C. the stomach. D. the small intestine. E. the liver.
Which blood vessel will deliver blood from the lower regions to the body?
a. Pulmonary artery b. Ventricle c. Superior vena cava d. Inferior vena cava e. Pulmonary vein
Which phase comes immediately after gastrulation?
a. fertilization b. organ formation c. cleavage d. gamete formation e. tissue specialization
Kinases are enzymes that can phosphorylate (transfer phosphate groups onto) macromolecules such as proteins. A particular kinase, Kinase 1 is known to promote cell division. It promotes cell division by phosphorylating Protein X. Phosphorylation of Protein X activates Protein X. Once activated, Protein X stimulates the production of other proteins such as Protein Y and Z that directly promote cell division. In order to function, Kinase 1 requires the presence of Metal A. However, in the presence of Protein A, Kinase 1 is nonfunctional. From the description, what is considered a cofactor of Kinase 1?
A. Protein A B. Protein X C. Protein Y D. Metal A E. Protein Z