Which of the following statements best describes the Hox genes of the different groups of animals?
A. All animals have Hox genes.
B. Invertebrate chordates have one cluster of Hox genes.
C. Gnathostomes have four clusters of Hox genes.
D. Hox genes are involved with the evolution of structural complexity.
E. All the choices provided are correct.
E. All the choices provided are correct.
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Which statement below best summarizes the overall purpose of the light-dependent reactions?
A. The light-dependent reactions capture the energy from the sun and convert it to glucose. B. The light-dependent reactions capture the energy from the sun and transfer it to high-energy molecules. C. The light-dependent reactions convert high-energy molecules into carbohydrates. D. The light-dependent reactions use energy to convert carbon dioxide into carbohydrate molecules.
Teratogenic effects of alcohol only occur during the first 12 weeks of pregnancy
a. True b. False
Indeterminate cleavage takes place in ____ and is characterized by a pattern of development where the ultimate fate of
each cell is ____. a. deuterostomes; not fixed until late in the developmental process b. protostomes; not fixed until late in the developmental process c. deuterostomes; fixed early in the developmental process d. protostomes; fixed early in the developmental process e. coelomates; fixed early in the developmental process
The fluid-filled space that helps reduce the friction of a beating heart is called the:a
endocardium. b. pericardial cavity. c. interventricular septum. d. fossa ovalis. e. auricle.