Choose correct options from statements below about the enzyme nitrogenase

I. can be found in most bacteria and a few invertebrate animals.
II. contains unique redox centers that contain both Fe and Mo.
III. changes in conformation as a result of ATP hydrolysis.
IV. carries out a reaction that reduces nitrogen to NO.

(a) I, II, III, IV
(b) II, III, IV
(c) II, III
(d) III, IV
(e) IV only

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.

Suppose a particular species of tulip plant has three alleles for the gene that codes for flower color. the cr allele produces red tulips, the cp allele produces purple tulips, and the cw allele produces white tulips. cr is dominant over cp and cw, and cp is dominant over cw. for each of the following crosses, determine the expected ratio of offspring for each flower color. cr cp x cp cw cr cw x cp cw 1 red: 1 purple : 0 white, 1 red: 2 purple: 1 white, 2 red: 1 purple 1 white, 1 red: 3 purple : 0 white, 2 red: 0 purple : 2 white, 2 red: 2 purple : 0 white