Which of the following is least important for the binding of a protein to single-stranded DNA?
A. hydrophobic interactions between guanine and tyrosine
B. hydrophobic interactions between adenine and phenylalanine
C. attraction between phosphate groups and lysine
D. attraction between phosphate groups and arginine
E. hydrogen bonding between deoxyribose and tyrosine
E
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Modification of bases in mRNA transcripts can change the mRNA sequence and thus the characteristics of the protein for which it codes
A. true B. false
Which of the following statements about European digger wasps, Philanthus triangulum, is not correct?
A. These wasps live and nest in the sand. B. After mating, each female digs a burrow and lays her eggs in a few chambers at the end. C. After foraging for honeybees to feed her larvae, she finds her nest in the sand using her specialized olfactory sheet. D. After foraging for honeybees to feed her larvae, she finds her nest in the sand using local landmarks around the nest. E. The wasp is capable of learning.
Interleukins (aka: cytokines) perform all of the
following functions EXCEPT a. stimulate inflammation. b. directly kill pathogens. c. stimulate T and B cell proliferation. d. activate natural killer cells. e. stimulate fever.
Which of the following is the cause of the STD known as lymphogranuloma venereum?
A) Neisseria gonorrhoeae B) Haemophilus ducreyi C) Chlamydia trachomatis D) Treponema pallidum E) Chlamydophila psittaci