Plasmodesmata are cell junctions that are similar in
function to
a. gap junctions in animal cells.
b. tight junctions in animal cells.
c. adhering junctions in animal cells.
d. the cuticle in plant cells.
e. stomata in plant cells.
Answer: a
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Comparing DNA and protein sequences to find evidence of a shared evolutionary history is called ________.
A) genomics B) proteomics C) differential relatedness D) bioinformatics
If you saw a vascular plant that was growing low to the ground with branching stems covered by small leaves in a helical pattern and that produced spores on leaves, you are most likely observing a(n):
A. fern. B. horsetail. C. gymnosperm. D. angiosperm. E. lycophyte.
Archaeans like Sulfolobus have multiple origins of replication. This suggests that they
a. in this regard, are more like bacteria than eukaryotes. b. in this regard, are more like eukaryotes than bacteria. c. have a unique form of chromosomal replication. d. have multiple plasmids, whose replication must be coordinated. e. have multiple chromosomes.
Cholesterol
a. has a rigid backbone of four carbon rings. b. is the most common steroid in animal tissue. c. is a lipid without a fatty-acid component. d. is needed to produce sexual development and maturity. e. is all of these.