Which of the following species concepts might differentiate species on the basis of specific dietary requirements?
A. Ring species
B. Ecological species
C. Evolutionary species
B
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How can repositioning nucleosomes affect transcription (select all correct choices)?
A. Moving nucleosomes could expose a promoter resulting in repression of transcription. B. Moving nucleosomes could cover a promoter resulting in repression of transcription. C. Moving nucleosomes could expose a promoter resulting in activation of transcription. D. Transcription is not affected by repositioning of nucleosomes.
The ectoderm is to the central nervous system as the mesoderm is to the
A. epidermis. B. respiratory tube. C. digestive tract. D. skeletal muscle. E. peripheral nervous system.
What is a gene?
A. A section of DNA that codes for a portion of a protein B. A discrete sequence of DNA nucleotides C. A section of DNA that codes for one or more proteins D. All of these and more are part of the expanding definition of a gene.
Sperm are produced in the
a. testes. b. vas deferens. c. epididymis. d. prostate gland. e. penis.