An example of homologous structures is the wing of a bat and the:a
arm of a human.
b. wing of a beetle.
c. tail of a whale.
d. leg of a chimpanzee.
e. dorsal fin of a shark
a
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What do steroid hormones need to travel from one cell to another?
a. binding to transport proteins in the bloodstream b. physical contact between the two cells c. budding a vacuole from the plasma membrane d. steroids travel freely through the bloodstream
In the early 1950s, James Watson and Francis Crick ____
a. were awarded the Nobel Prize for Medicine or Physiology b. combined all of their previous research in order to explain the structure of DNA c. began to work out the structure of DNA by organizing the information about DNA that was already available d. produced X-ray diffraction photographs from highly purified DNA samples e. isolated two strains of S. pneumoniae and used them to further research the structure of DNA
The type of bond that forms between two atoms when electrons are shared is a(n) ________ bond.
A. covalent B. kinetic C. ionic D. hydrogen
A friend asks you how exocrine glands differ from endocrine glands. She knows that both form from invaginated epithelium. How do you respond?
A. The liver is an endocrine gland that secretes directly into epithelial tissues. The pituitary gland is an exocrine gland that secretes into the blood stream. B. Exocrine glands produce hormones that enter the blood stream, while endocrine glands secrete sweat and oil directly to the surface of the skin. C. Exocrine and endocrine glands are essentially the same, both produce products that are secreted to the skin's surface. D. Exocrine glands are found in the thoracic cavity while endocrine glands are located in the pleural cavity. E. Endocrine glands produce hormones that enter the blood stream, while exocrine glands secrete sweat and oil directly to the surface of the skin.