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

Biology & Microbiology

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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.

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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

Biology & Microbiology

Which phase comes immediately after gastrulation?

a. fertilization b. organ formation c. cleavage d. gamete formation e. tissue specialization

Biology & Microbiology

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

Biology & Microbiology