Why would a female song bird choose to mate with a male that has a large song repertoire? Because
A. females tend to select traits that are well developed to judge fitness of a male.
B. females judge by feather color and voice of the male.
C. a long song allows the female to study the male for any physical defects before mating.
D. immature males have a long varied song where older, less fit males will have a short song.
E. females only judge fitness by physical appearance, not song repertoire.
A. females tend to select traits that are well developed to judge fitness of a male.
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The half-life of carbon-14 is 5730 years. Approximately how old is a fossil that contains .25g carbon-14 and .75g nitrogen-14?
A. 11,460 years B. 5730 years C. 17,190 years D. 22,920 years E. 28650 years
Which of the following statements about joints is false?
A. A hinge joint can be controlled by two antagonist muscles, whereas ball and socket joints require at least four sets of muscle antagonists. B. The shoulder is the most mobile joint in the human body. C. A ball-and-socket joint is less stable than a hinge joint. D. Ball-and-socket joints allow motion along three axes, whereas hinge joints limit motion to one axis of rotation. E. The range of motion of a joint is determined by the shapes of the bone surfaces that meet at the joint.
Patients are instructed to collect sputum specimens in such a way as to minimize contamination with normal microbiota from the mouth. A sputum specimen has arrived in the clinical laboratory and a Gram-stained smear of the specimen reveals a mixture of Gram-positive cocci, Gram-negative cocci, and Gram-positive bacilli as well as numerous squamous epithelial cells.This result indicates
A. a poor quality specimen of primarily saliva and oropharyngeal microbiota. B. that the specimen has been properly collected and is representative of sputum. C. that the patient has bacterial pneumonia rather than viral pneumonia. D. that the patient has a pneumonia caused by a mixture of different bacteria.
Recombinant DNA is any DNA that
a. has been cut by restriction enzymes. b. is at least four to eight base pairs in length. c. has had its gene sequence rearranged. d. consists of base pairs from two or more organisms e. is none of these.