An unknown chemical is analyzed and found to contain the bases thymine and guanine. This chemical is most likely
A. mRNA.
B. tRNA.
C. DNA.
D. rRNA.
Answer: C
You might also like to view...
Toxic substances accumulate through natural trophic flow of an ecosystem.
Answer the following statement true (T) or false (F)
Despite living their entire lives in saltwater, most marine invertebrates do not struggle with the hypertonic environment. Which of the following explains this phenomenon?
a. Their body fluid concentrations conform to changes in seawater concentration through physiological adaptations. b. Their cells have seawater inside of them, making them isotonic to their environment. c. They absorb extra water at all times to dilute the salt concentration. d. They are capable of metabolizing the salt in vast quantities and excreting the sodium and chlorine.
Use the following points to compare transpiration and translocation
1. Principle substance(s) transported 2. Direction of transport 3. Tissue through which transport occurs 4. Name of model that explains the process 5. Does the plant expend energy to carry out the process? What will be an ideal response?
Some animal populations are kept in check by
A. hosts. B. decomposers. C. amensalism. D. predators.