What is the photopigment in rod cells called?
A. photopsin
B. rhodopsin
C. opsin
D. carotene
E. melanin
B. rhodopsin
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Nongonococcal urethritis may be caused by the protozoan ________
A) Chlamydia trachomatis B) Neisseria gonorrhoaea C) Haemophilus ducreyi D) Trichomonas vaginalis
A graph of phenotypic variation similar to the
illustration above strongly suggests a. incomplete dominance. b. codominance. c. epistasis. d. polygenic inheritance. e. environmental effects on phenotype
Cancer(s) of which of the following is (are)
associated with chronic smoking? a. larynx b. esophagus c. pancreas d. bladder e. all of these
The Cas9 nuclease is able to cleave target DNA at a single precise site by ________.
A. recognizing a palindromic sequence on the DNA and cleaving at that site leaving sticky ends B. associating with a single-stranded DNA molecule that binds to its complement on the genome to be cleaved C. using a guide RNA that hybridizes to a unique sequence on the target DNA molecule D. altering its active site to bind to and cleave any DNA sequence that is targeted