What is the photopigment in rod cells called?  

A.  photopsin
B.  rhodopsin
C.  opsin
D.  carotene
E.  melanin


B.  rhodopsin

Biology & Microbiology

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Nongonococcal urethritis may be caused by the protozoan ________

A) Chlamydia trachomatis B) Neisseria gonorrhoaea C) Haemophilus ducreyi D) Trichomonas vaginalis

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology