Animals most likely evolved from a colony similar to __________, a type of protist. Fill in the blank(s) with the appropriate word(s)
ANSWER: choanoflagellates
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When separating DNA fragments by gel electrophoresis, what is the purpose of including molecular weight markers?
A. Markers are needed to estimate the relative charges on each of the restriction fragments. B. Markers ensure that fragments having a greater molecular weight migrate at the same rate as those having a lighter molecular weight. C. Markers provide an indication as to the total number of restriction fragments on the gel. D. Markers are used as a control to determine the relative size of restriction fragments.
The bones of a bird's wing are similar to the bones of a bat's wing. This observation is an example of _____
a. uniformity b. evolution c. comparative morphology d. a lineage
The two categories of stem cells in the human body are embryonic stem cells and adult stem cells. Therefore, stem cells can be found in
A. embryos, after division of the original zygote. B. skin cells. C. All of the answer choices are correct. D. adults, in several specialized tissues. E. the bone marrow.
Animals most likely evolved most recently from ____
a. colonial protists b. fungi c. amoebozoans d. algae e. cyanobacteria