Why is the eukaryotic tree of life unrooted? (Select all correct choices.)
A. There are too many common ancestors to
choose one.
B. The last common ancestor of the total
group is not known.
C. There is not enough molecular
sequencing data to determine a root.
D. There are not enough synapomorphies to
determine a root.
B,C
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The identity of flower organs is specified by the spatial expression of three classes of homeotic genes
A. true B. false
Which organelle is NOT a part of the endomembrane system?
a. the endoplasmic reticulum b. the lysosome c. the nucleolus d. the Golgi complex
Atomic mass refers to the sum of the number of ________ and ________ of an atom.
What will be an ideal response?
Which of the following processes likely depends on the activity of a proton pump? Pick the best answer!
(a) Sugar uptake (b) Osmosis (c) Uptake of nitrate (d) One of the above (e) Two of the above