Melting of ice and thus reduced feeding opportunities for polar bears is occurring because of the ________.
A) increase in phytoplankton population
B) drying up of lakes and streams
C) constant breaking and reforming of hydrogen bonds in water
D) increase in CO2 and other greenhouse gases in the atmosphere
Ans: D) increase in CO2 and other greenhouse gases in the atmosphere
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Motor neurons serving smooth and cardiac muscle are part of the somatic nervous system.
a. true b. false
The accompanying figure shows a pedigree and the results of a Southern blot analysis of the ?-globin gene for four family members (II-1, II-2, II-4, and II-5). III-2 was just born and neither her health nor her DNA has been analyzed
The figure also shows a restriction map of ?A and ?S alleles and the location of three DNA probes (A, B, and C). If III-2 is analyzed by Southern blot using the same probe(s) as that used on other members of the family, what is the probability that the result will be only one band? A) 0 B) 1/9 C) 1/6 D) 1/4 E) 2/3
When some animals mature, they then migrate long distances to their breeding grounds or to escape
harsh weather. A signal for this type of behavior is often:a. a conditioned stimulus. b. day length. c. negative reinforcement. d. a sign stimulus. e. territoriality.
Which of the following is lowest in unsaturated fats?
A) beef B) salmon C) corn oil D) canola oil