Which one of the following is not a characteristic shared by miRNA and mRNA?
A. They are both encoded by genes on
chromosomes.
B. They are both transcribed using the same
RNA polymerase and general transcription
factors.
C. They both have a 5' cap and are both
spliced.
D. They both fold upon themselves, forming
stems and hairpin loops that are stabilized by
hydrogen bonding.
E. They both have a 3' poly(A) tail.
D
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The sex life of the saguaro cactus begins
a. immediately after formation. b. after 5–10 years. c. after 35–50 years. d. after 100 years
In a fruit fly embryo, a homeotic gene Antp determines where legs grow. When the promoter of Antp is mutated, a fly ends up with legs growing out of its head in place of antennae. In this mutation
A. antennae grow where the legs would normally be found. B. Antp must be turned off in all of the fly cells. C. Antp must be turned on in the head. D. the Antp gene, and its transcription factor, and enhancer sequence are turned on in the head. E. the Antp enhancer sequence, or transcription factor, is not functional.
Which of the following pairs is mismatched?
A) Neisseria meningitidis — produces deadly endotoxins
B) Haemophilus influenzae — virulence due to capsule
C) Mycobacterium leprae — cultured in armadillos
D) Cryptococcus neoformans — acid-fast rod
E) Naegleria fowleri — causes amoebic encephalitis
Wherever there is an adenine on a DNA strand, during transcription it will be base-paired with a ________ on an RNA strand
A) adenine B) cytosine C) uracil D) guanine E) thymine