A(n) ________ in a community is made up of the organisms feeding at the same number of steps away from the sun.
Fill in the blank(s) with the appropriate word(s).
trophic level
A tropic level in a community is made up of the organisms feeding at the same number of steps away from the sun.
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Describe the relationship of insulin and glucagon
What will be an ideal response?
A eukaryotic transcription unit that is 8,000 nucleotides long may use 1,200 nucleotides to make a protein consisting of approximately 400 amino acids. This is best explained by the fact that
A. many nucleotides are needed to code for each amino acid. B. there are termination exons near the beginning of mRNA. C. many noncoding stretches of nucleotides are present in eukaryotic DNA. D. there is redundancy and ambiguity in the genetic code. E. nucleotides break off and are lost during the transcription process.
The figure shows a simplified phylogeny of closely related species of primates. This tree was proposed by comparing DNA sequence changes in the gene for cytochrome oxidase subunit II. The vertical scale represents time and the branch points represent common ancestors. What species did ancestor B give rise to?
A. Siamangs and orangutans.
B. All of the species except orangutans.
C. All of the species except siamangs.
D. All of the species except siamangs and pigmy chimps.
Which one of the following was not an adaptation seen in the sharks (Chondrichthyes)?
A. lateral line system B. internal fertilization and internal development C. swim bladder D. teeth E. calcified cartilaginous skeleton