Homologous structures have evolved from the same structure in a common ____________.
Fill in the blank(s) with the appropriate word(s).
Ans: Ancestor
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Inside each leaf vein, ____ transports water and dissolved mineral ions to photosynthetic cells, while ____ transports products of photosynthesis (sugars) away from them
a. xylem; phloem b. phloem; xylem c. parenchyma cells; sclerenchyma cells d. sclerenchyma cells; parenchyma cells e. vessel elements; sieve elements
What is the name of the figure shown below that depicts the staining and photographing of an entire set of duplicated, condensed chromosomes from a single cell?
A) Cytosmear B) Cell smear C) Pap smear D) Karyotype E) Karyogram
The relatively large number of new mutations that occur in the human genome each generation is tolerable because:
A. we have excellent DNA repair mechanisms. B. most of the mutations occur in somatic cells, not germ cells. C. most of our genome is non-coding DNA, so few mutations affect our proteins. D. we have excellent protein repair mechanisms. E. compared to other organisms, changes in our proteins have relatively little affect on our cells' structure and function.
Describe why many vent animals that house chemosynthetic bacteria are not harmed by the sulfide compounds in their blood, which normally would be toxic to these animals
What will be an ideal response?