Homeotic Genes Contain a Homeobox Sequence That Is Highly Conserved

question 45

Multiple Choice

Homeotic genes contain a homeobox sequence that is highly conserved among diverse species. The homeobox sequence encodes a protein domain that binds DNA and regulates development. Which of the following statements is correct regarding homeotic genes?

• A) Homeotic genes are selectively expressed as an organism develops.
• B) Homeoboxes cannot be expressed in invertebrate species.
• C) Homeotic genes in apes and humans are very different.
• D) Homeobox sequences have shown convergent evolution among species.

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Definitions:

Calculus

A branch of mathematics dealing with the study of change, in the same way that geometry is the study of shape and algebra is the study of operations and their application to solving equations.

Sediment

Particles that settle at the bottom of a liquid; in medicine, it may refer to the solid material that settles at the bottom of a urine sample.

Urochrome

A pigment that gives urine its typical yellow color, produced as a by-product of the breakdown of hemoglobin in red blood cells.

Uric Acid

A waste product formed from the breakdown of purines, eliminated through urine.