Which is true about the structure and function of a gene?
A. It is a sequence of nucleotides in DNA that contains information necessary for the synthesis of proteins.
B. It is a sequence of nucleotides in DNA that acts as an enzyme to digest proteins.
C. It is an uncoiled protein that contains information necessary for the synthesis of other proteins.
D. It is composed of many molecules of DNA and contains information needed to make RNA.
Answer: A
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At the bifurcation of the aorta in the pelvic region, the _______ artery arises to supply the sacrum and coccyx
A. lumbar B. posterior intercostal C. subclavian D. median sacral E. femoral
Parietal arteries that branch from the thoracic (descending) aorta
A. supply the thoracic organs. B. include the posterior intercostal arteries. C. include the anterior intercostal arteries. D. include the superior phrenic arteries. E. include both the posterior intercostal arteries and include the superior phrenic arteries.
Which of the following illustrates a gradient?
A) more of something exists in one area than another and the two areas are connected B) equilibrium or balance between two unconnected areas C) maintenance of a relatively stable internal environment D) equal amounts of something exist in areas that are connected
Answer the following questions true (T) or false (F)
1. Vaccinations elicit a primary immune response so that secondary immune responses are rapid and symptoms are mild. 2. Bacterial infections and viral infections progress through an identical sequence of events during the immune response. 3. Immunodeficiency disorders can result from a failure of one component of the immune system.