Question: Who plays the science officer on star trek discovery?

Disambiguated questions and answers:
context: In November 2016, Doug Jones and Anthony Rapp were revealed to be cast, as science officers Saru and Stamets, respectively. The former is a Kelpien, an alien race created for the series, while the latter is the first "Star Trek" character to be conceived and announced as gay. Sonequa Martin-Green was cast in the lead role in December, which was officially confirmed in April 2017, with the character's name revealed to be Michael Burnham. Also in December, Shazad Latif was cast as the Klingon Kol. In March 2017, Jason Isaacs was cast as Captain Lorca of the USS "Discovery", and Mary Wiseman joined as Tilly, a cadet. At the end of April, Latif was revealed to have been recast in the role of Starfleet Lieutenant Tyler. In the series, this role is shown to be an undercover persona used by the Klingon Voq, who was initially credited as being portrayed by the invented actor Javid Iqbal to hide the fact that Latif was portraying both Voq and Tyler.
question: Who plays the science officer on star trek discovery who is a chief engineer?
short_answers: Anthony Rapp

Anthony Deane Rapp
wikipage: Star Trek: Discovery

context: Saru (portrayed by Doug Jones) is a commander serving as first officer of the USS "Discovery", and the first Kelpien to enter Starfleet. Saru was introduced in the series premiere as a lieutenant commander serving as chief science officer on the USS "Shenzhou", which is rendered a hulk during a battle in the series' second episode. Before the events of "Context Is for Kings", Saru becomes first officer on the USS "Discovery".
question: Who plays the science officer on star trek discovery who is a Kelpien?
short_answers: Doug Jones
wikipage: List of Star Trek: Discovery characters

context: Michael Burnham (portrayed by Sonequa Martin-Green) is a science specialist aboard the USS "Discovery". Burnham was First Officer of the USS "Shenzhou", where she was referred to as "Number One", until she was convicted of mutiny and sentenced to life in prison. "Discovery" captain Gabriel Lorca, brings Burnham back to duty with a temporary wartime assignment as a scientist on his ship. Burnham was raised following Vulcan culture and traditions by Sarek, and is the first human to attend the Vulcan Learning Center and Vulcan Science Academy.
question: Who plays science officer Michael Burnham on Star Trek Discovery?
short_answers: Sonequa Martin-Green
wikipage: List of Star Trek: Discovery characters

Long answers:
knowledge: content: His screen roles include Lieutenant Commander Paul Stamets on the television series Star Trek: Discovery.
wikipage: Anthony Rapp
long_answer: Anthony Rapp plays Lieutenant Commander Paul Stamets on the television series Star Trek: Discovery. Doug Jones plays Saru, a commander serving as first officer of the USS "Discovery", and the first Kelpien to enter Starfleet and Michael Burnham (portrayed by Sonequa Martin-Green) is a science specialist aboard the USS "Discovery". 

knowledge: content: Star Trek: Discovery is an American television series created by Bryan Fuller and Alex Kurtzman for the streaming service CBS All Access (later rebranded as Paramount+). Premiering in 2017, it is the seventh Star Trek series and was the first since Star Trek: Enterprise concluded in 2005. It begins a decade before Star Trek: The Original Series and follows the crew of the USS Discovery.

Sonequa Martin-Green stars as Michael Burnham, a science specialist on Discovery who eventually becomes captain. Doug Jones, Shazad Latif, Anthony Rapp, Mary Wiseman, Jason Isaacs, Wilson Cruz, Anson Mount, David Ajala, Rachael Ancheril, Blu del Barrio, and Ian Alexander also star. 
wikipage: Star Trek: Discovery
long_answer: Star Trek: Discovery is an American television series, the seventh Star Trek in the series, and was the first since Star Trek: Enterprise concluded in 2005. It begins a decade before Star Trek: The Original Series and follows the crew of the USS Discovery. Sonequa Martin-Green stars as Michael Burnham, a science specialist on Discovery who eventually becomes captain. Doug Jones, Shazad Latif, Anthony Rapp, Mary Wiseman, Jason Isaacs, Wilson Cruz, Anson Mount, David Ajala, Rachael Ancheril, Blu del Barrio, and Ian Alexander also star in the show.