What were the original two Kingdoms that were established to organize living organisms?

What is the main function of the ozone layer?

a. to provide cloud cover for protection of polar regions b. to provide a source of oxygen for photosynthesis c. to filter toxins from acid rain d. to block most of the sun's damaging rays from reaching Earth e. to trap carbon dioxide and warm the planet

Which of the following was determined by

Rosalind Franklin’s research?

a. DNA is a double helix b. DNA has a phosphate backbone on the outside c. DNA bases are arranged on the inside d. DNA’s diameter e. all of these were determined by Rosalind Franklin’s research

Patients with schizophrenia often exhibit physiological changes including (A)_______ ventricles, (B)__________ and abnormal clusters of neurons compared to healthy human brain.

a. (A) smaller (B) less numbers of neurons b. (A) enlarged (B) higher numbers of neurons c. (A) smaller (B) higher numbers of neurons d. (A) enlarged (B) less numbers of neurons

Manx cats have no tails. When two Manx cats are bred together there is always a one third chance that a kitten will have a tail. When a Manx cat is bred to a cat with a normal tail there is a one-half chance that a kitten will have a tail

Which of the following is the best explanation for this? A) The Manx genotype exhibits variable expression. B) The Manx phenotype is dominant, but the allele is a recessive lethal. C) The Manx phenotype is dominant epistatic. D) The Manx phenotype is caused by gene interactions. E) The Manx phenotype is a result of heteroplasmy.