Chargaff found that the amounts of the four bases vary from species to species, but the amount of adenine always equals the amount of guanine and the amount of thymine always equals the amount of cytosine
Indicate whether the statement is true or false
FALSE
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A microbial cell's membrane is considered ________, because its internal constituents are maintained within the cell. However, it also imports and exports other molecules in response to its environment
A) differential B) microselective C) rigid D) semipermeable
What proportion of the solar radiation that reaches Earth's surface is visible light?
A) A small fraction is visible light. B) Most of the radiation is absorbed by rocks on Earth's crust. C) About half is visible light. D) It is captured by plants and used in photosynthesis. E) About 90% of it is visible light.
Since all organisms carry on cellular respiration, all living cells must contain mitochondria.
Answer the following statement true (T) or false (F)
A scientist studied peregrine falcons to determine why the numbers of birds was declining. She determined that
A. global warming (too much carbon dioxide) had increased the death rates in the newly hatched chicks. B. the genetic diversity of the falcons was too low to sustain their population level. C. the falcons had lost much of their habitat due to human developments. D. the falcon's habitat had been fragmented and the subsequent edge effect affected their ability to hunt for prey items. E. the levels of DDT in the environment were having a detrimental effect on eggs (causing the eggshells to be too thin) that were being laid by the female falcons.