How do fossils provide evidence of evolution? How are scientists able to determine the age of fossils? What will be an ideal response?
Concepts to Consider: Fossils show the transitional forms between extinct and extant forms;
carbon-based fossils of recent times may be dated using carbon-14; older fossils are typically
dated using potassium-40.
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What happens when a seed absorbs water and causes the plant embryo to release gibberellin?
a. Glucose levels decrease as a direct effect of gibberellin on the endosperm. b. The aleurone starts expressing amylase inhibiting transcriptional repressors. c. A protein-rich layer of cells surrounding endosperm starts growing in response to the hormone. d. The endosperm absorbs the hormone. e. Amylase is released from the aleurone and breaks down starch in endosperm.
Birds store food in a modified portion of the lower esophagus called the
A. pharynx. B. gizzard. C. alimentary canal. D. crop. E. epiglottis.
Which of the following is an example of an "executioner" enzyme in the cell?
a. caspases b. cytokinin c. kinase d. roscovitine
Select the best response to the question. A patient who contracts a strain of the flu has ?immunity in the future against that same strain of the flu. This is an example of which type of immunity?
A) natural active immunity B) artificial passive immunity C) the patient does not develop any immunity D) artificial active immunity