In genetics, what are palindromes?
A) the types of DNA sequences that are cut out by restriction enzymes
B) the A-T complementary bases of DNA
C) the C-G complementary bases of DNA
D) the A-U base pairing between DNA and mRNA
A
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How many times better is the resolution of the transmission electron microscope than the resolution of the unaided human eye?
A) 1,000 B) 10,000 C) 100,000 D) 1,000,000
Mucus secreted by mucous membranes provides protection against infections by
A) forcing the pathogen to die in the struggle to free itself (like a fly strip). B) trapping and removing pathogens. C) phagocytosing pathogens by macrophages. D) destroying pathogens by the complement system. E) drowning the pathogen.
Which of the following is included in the lariat structure?
a. the intron b. the exon c. the snRNP d. the mRNA
The discovery of extinct glyptodont fossils and their close resemblance to present-day armadillos led Darwin to make which of the following deductions?
a) All species remain unchanged b) Populations must grow faster than the available food supply. c) Conditions of the day were not suitable for the glyptodonts. d) The present-day armadillos were ancestors of the much larger glyptodonts. e) Extinction was part of the natural "circle of life".