The famous Cambrian-era fossil deposit known as the Burgess Shale is now estimated to contain fossils of how many animal phyla?
A) None?animals had not appeared at the time.
B) just two or three anatomically simple animal phyla
C) about the same number as those alive today
D) two or three times as many as alive today
E) about half as many as are alive today
C
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How are symbiotic relationships important in agriculture and food production? Use at least two different examples to support your answer and explain how understanding these symbioses could help produce more food
What will be an ideal response?
If a human gene mRNA were placed into a cell of yeast, it would be:
a. degraded immediately. b. translated into a repeating amino acid chain. c. translated into a chain of random amino acids not resembling the protein in humans. d. translated into the protein that is found in humans. e. integrated into the genome of the yeast.
Abdul, who is 6 years old and beginning his first day of school, comes into his classroom where some other children are eating peanuts. Within a few minutes he complains of dizziness and seems to be struggling to breathe. You suspect ________
A) chickenpox B) anaphylactic shock C) cancer D) Kaposi's sarcoma
ADH increases fluid retention when the body sweats and decreases fluid retention when someone has consumed large amounts of water. This is an example of
A) positive feedback. B) negative feedback. C) neurotransmitter activity. D) paracrine communication. E) synaptic communication.