Transferring Euglena into a dark environment results in the loss of photosynthetic pigment. What conclusion does this support?
A. Euglenoids are neither plant-like or animal-like protists.
B. Euglenoids are closely related to plants.
C. Euglenoids are obligate photoautotrophs.
D. Light triggers heterotrophy.
Answer: A
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Breathing rates are automatically increased
when ___ levels are ___.
a. oxygen...high b. carbon dioxide...high c. oxygen...low d. carbon dioxide...low e. ATP...low
In eukaryotic cells, we sometimes find reverse transcriptase activity, even though the cells are not infected with a retrovirus. This activity can be attributed to
A) the presence of transposons integrating into polymerase genes. B) the presence of viroids. C) the presence of retrotransposons. D) infection with small bacteria known as mycoplasmas. E) a novel prion infection.
Which of the following diseases cannot currently be prevented by vaccination?
A) AIDS B) polio C) measles D) tetanus
Which of the following statements in TRUE?
A. Euchromatin, found in interphase cells, is readily visible and easily viewed. B. Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA. C. A region of DNA is either heterochromatin or euchromatin, it cannot go back and forth between the two forms. D. When DNA is being replicated, the chromosomes are composed chiefly of heterochromatin. E. All of the answers are correct.