In which way are bacteria and eukaryotes the same?
A. Contain membrane-bound organelles
B. Contain a nucleus to hold DNA
C. Have a cell wall for rigidity
D. Contain ribosomes for protein synthesis
Answer: D
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Comparison of common chromosomal banding patterns between humans and 5 other species are given below. Based on these data, humans are least related to
A) gorillas: 99% common chromosome bands. B) African green monkeys: 95% common chromosome bands. C) domestic cats: 35% common chromosome bands. D) mice: 7% common chromosome bands.
Natural selection quickly eliminates harmful alleles from the population
Indicate whether the statement is true or false.
How could an embryonic stem cell be used to repair a severed spine?
A) Embryonic stem cells secrete proteins that repair all other cell types, including nerve cells. B) Embryonic stem cells can grow into any other cell type, including a nerve cell. C) Embryonic stem cells can cause any other cell type to multiply. D) Embryonic stem cells are primarily involved with neural growth and development.
As part of your research project, you travel to an island to learn more about the habitats and relationships of flies, spiders, and centipedes. You and your assistant plot out five different areas on the island and count the numbers of flies, spiders, and centipedes living in each plot. Your results show the following: Plot Flies Spiders Centipedes1300254242617103147152147397805791393The most plausible explanation for the high number of spiders in plot 4 is:
A. the flies and spiders worked together to eliminate the centipedes. B. there are too many flies overall. C. the spiders preyed on the centipedes and ignored the flies. D. there are no centipedes to prey on the spiders and there are abundant flies upon which to feed.