Why do snakes flick their tongue when they see potential prey?
A. They are trying to bring scent molecules into the mouth so the Jacobson's organs can decipher them.
B. Snakes use tongue flicking as a means of communication.
C. They are trying to detect the various scent molecules with their tongue.
D. All of the choices are correct.
Answer: A
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The first evidence of where the nerve cord will lie in the embryo is the
a. neural tube. b. chorionic villus. c. embryonic somite. d. primitive streak. e. neural plate.
A detailed analysis that tracks several generations of a family history is a ____
a. carrier chart b. pedigree c. syndrome chart d. genetic chart e. karyotype
The bulk of the energy required by the eukaryotic cell is generated by the mitochondria. The mitrochondrion consists of cristae that
A) form a smooth, continuous outer membrane surrounding the entire organelle. B) form a complex fluid called a matrix outside the organelle. C) are elaborate folds on the inner membrane which hold the enzymes and electron carriers of aerobic respiration. D) are circular strands of DNA involved in producing the enzymes needed for anaerobic respiration.
Genomics studies have shown that humans and rice share about ____ percent of their genomes.
A. 1 B. 4 C. 8 D. 15 E. 25