Scientists Using RNA in Situ Hybridization Techniques Observed That a Transcription

question 5

Multiple Choice

Scientists using RNA in situ hybridization techniques observed that a transcription factor called macho-1 localized to some cells during early cleavage,but not others.Descendents of these cells expressing macho-1 produce mesodermal tissues.If you prevented the expression of macho-1 in an embryo during cleavage,which structures might you expect to be absent in later development?

• A)neural tube
• B)somites
• C)digestive system
• D)skin

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Definitions:

Classical Conditioning

The process of learning through the connection between an environmental stimulus and a stimulus that occurs naturally.

Conditioned Stimulus

An initially neutral trigger that, through association with the unconditioned stimulus, eventually prompts a conditioned response.