Which mutation would have the greatest likelihood of being retained in the gene pool?
a) A point mutation in the exon of a gene
b) A point mutation in a non-coding region of DNA
c) A translocation event that swaps the arms of two chromosomes
d) A missense mutation that prematurely shortens the length of a translated peptide
Answer: b) A point mutation in a non-coding region of DNA
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For multicellularity to develop, there must be a mechanism of communication among cells in the multicellular organism. Which of the following structures present in the cell membrane receives signals from the environment?
A. plasmodesmata B. receptors C. gap junctions D. cadherins
You are a doctor are examining a patient whose thymus never developed because of DiGeorge syndrome
You know that this medical condition is usually due to the deletion of a section of chromosome #22 and that a single copy of shortened chromosome causes the syndrome. The patient's parents are both phenotypically normal with normal thymuses. This suggests that _____________. A. both parents are heterozygous B. both parents are homozygous recessive C. the individual inherited the trait from his grandparents. D. the deletion occurred during gamete formation and thus was not part of the parents' genome.
Members of the ____ are thought to have given rise to plants
a. red algae b. diatoms c. euglenoids d. green algae e. dinoflagellates
In a food chain with four trophic levels, what would be the energy in the top trophic level if the energy contained in the primary producer level is 40,000 kcal/m2/yr? Assume a trophic level transfer efficiency of 10%.
A. 4,000 kcal/m2/yr B. 40 kcal/m2/yr C. 0.4 kcal/m2/yr D. 4 kcal/m2/yr E. 400 kcal/m2/yr