Which are reasons for the Cambrian Explosion? Check all that apply.
_____ increased oxygen.
_____ Hox genes.
_____ mammalian dominance.
_____ increased ozone.
_____ coevolution of predator and prey.
__X__ increased oxygen.
__X__ Hox genes.
_____ mammalian dominance.
__X__ increased ozone.
__X__ coevolution of predator and prey.
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Following reports that stained chromosomes "disappeared" while observing cell division, scientists in the early 1900s determined the molecule of heredity to be
A) DNA. B) RNA. C) protein. D) lipids. E) carbohydrates.
The first committed step of Krebs cycle is:
a. acetylCoA synthesis b. oxaloacetate regeneration c. citrate synthesis d. isocitrate dehydrogenation e. pyruvate decarboxylation
In a lichen that is in a mutually beneficial relationship, what does the mycobiont receive?
a. aid in sexual reproduction b. enhanced dispersal of offspring c. nutrients d. protection from herbivory
The inability of a man to produce LH would result in
A. exaggerated secondary sex characteristics. B. the inability of Leydig cells to produce testosterone. C. the loss of positive feedback control on FSH release. D. the inability of the anterior pituitary to produce FSH. E. decreased GnRH production by the hypothalamus.