Which of the following events is an important factor in increasing variety among sexually reproducing organisms?
A.) testcross
B.) gene linkage
C.) crossing over
D.) mitosis
Ans: C.) crossing over
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How does losing or acquiring territory affect the brain anatomy and chemistry of an African cichlid
fish?
a. size of the brain is changed b. shape of brain is changed c. the size and shape of the brain is changed d. the size of brain cells producing GnRH are changed e. the size of brain cells producing territorial hormone are changed
Prions can be transmitted by all of the following except
A. surgical instruments. B. cornea transplants. C. ingesting meat from infected animals. D. ingesting brain material. E. All of the choices have been documented as methods of prion transmission.
A solution with a pH of 6 has ________ times as many hydrogen ions as a solution with a pH of 8
A) 1,000 B) 10 C) 100 D) 10,000 E) 100,000
How are the nucleotide monomers connected to form a polynucleotide?
a. hydrogen bonds between complementary nitrogenous base pairs. b. ionic attractions between phosphate groups c. disulfide bridges between cysteine amino acids. d. covalent bonds between the sugar of one nucleotide and the phosphate of the next e. ester linkages between the carboxyl group of one nucleotide and the hydroxyl group on the ribose of the next