Which of the following enzymes join the
paired sticky ends of DNA fragments?
a. reverse transcriptases
b. restriction enzymes
c. DNA ligases
d. DNA polymerases
e. polynucleotide kinases
C
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Dll is a gene known to direct limb development in the fruit fly
Researchers studying this gene have found that it is also expressed in developing appendages in animals from many other phyla, supporting the hypothesis that all animal appendages may be homologous. However, suppose researchers looking at Dll activity had instead found the results shown in the figure above. These results suggest instead that _____. A) Dll is not actually involved in appendage development B) appendages evolved separately in protostomes and deuterostomes C) appendages coevolved with segmentation D) all animal appendages are homologous
The rbcL gene, which has been useful in evolutionary studies in plants, is located in ____
a. mitochondrial DNA b. chloroplast DNA c. nuclear DNA d. mitochondrial and chloroplast DNA e. chloroplast and nuclear DNA
As a result of being cloned, Dolly exhibited abnormalities not seen in normally reproduced sheep. One of these abnormalities was she
A. developed arthritis in her hind legs. B. was able to reproduce asexually, without requirement of a male sperm. C. developed lung disease at a young age of six years. D. developed arthritis in her back. E. gave birth to healthy lambs through normal sexual reproduction.
Anthropoids arose at least:a
45 million years ago. b. 22 million years ago. c. 10.2 million years ago. d. 5 million years ago. e. 2.6 million years ago.