During an experiment assessing the development of a fly embryo, a scientist artificially turns on a homeotic gene that controls eye development in somatic cells that normally develop into the wings. Which of the following is the most likely outcome of this experiment?
A) A normal adult fly will develop.
B) A mutant adult fly will develop that has eyes on its wings.
C) A mutant adult fly will develop that has legs on its head.
D) A mutant adult fly will develop that has no eyes on its head but has eyes on its wings.
Answer: B
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What adaptations are observed in trachea and lungs to reduce water loss?
A) A countercurrent exchange system reduces water loss in animals with either trachea or lungs. B) The location of the trachea and lungs (inside of the body) reduces water loss. C) Trachea and lungs secrete specialized oxygen-carrying chemicals to reduce water loss. D) Limbs are used by animals with trachea or lungs to move water over these structures.
Protein breakdown produces ____
a. nitrogen gas b. carbon dioxide c. ammonia d. carbon monoxide e. oxygen
Each of the following is a good functional match between animal and plant extracellular structures or fibers except
A) elastins–extensins. B) extracellular matrix–cell wall. C) collagens–cellulose. D) proteoglycans–hemicelluloses. E) fibronectins–pectins.
Which part of an amino acid is always acidic?
a. Amino functional group b. Carboxyl functional group c. Side chain ("R group") d. None of the above