Mammalian Alu elements are likely derived from
a. retroviruses.
b. regions of tndemly repeated sequences.
c. 7SL RNA transcripts.
d. introns transposed from functional genes.
e. reverse-transcribed mRNAs.
Ans: c
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Plants have collections of totipotent stem cells called ____
Fill in the blank with the appropriate word.
Which of the following is a function of an exoskeleton?
A. Exoskeletons provide protection. B. Exoskeletons help reduce water loss in terrestrial species. C. Exoskeletons provide support. D. Exoskeletons provide a site for muscle attachment. E. All of the answer options are correct.
Which term BEST describes populations of trees, insects, mammals, fungi, bacteria, and many other organisms that interact in any location?
A. biosphere B. ecosystem C. bioregion D. community
Please select characteristics exhibited by prokaryotes to test your understanding of the differences between prokaryotic and eukaryotic organisms.
> DNA > Nucleus > Golgi body > Ribosomes > Cell wall