Sporophyte spores are produced via meiosis in a protective structure called a
a. sporocyte
b. sporangium
c. sporocyst
d. archegonium
e. antheridium
Ans: b. sporangium
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One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?
A. <1,000 Daltons B. >1,000 Daltons, but <1,500 Daltons C. >10,000 Daltons D. >5,000 Daltons, but <10,000 Daltons E. >1,500 Daltons, but <5,000 Daltons
Our current view of membrane structure is based on the fluid mosaic model, proposed by ____ in
1972.
a. H. Davson and J. Danielli b. I. Langmuir c. C. Overton d. S. Singer and G. Nicolson e. E. Gorter and F. Grendel
What is the general name given to the most highly condensed form of chromatin?
A. X chromatin B. euchromatin C. 30-nm chromatin fiber D. nucleosome E. heterochromatin
Evolutionarily, the jaws of vertebrates developed from
A. the operculum. B. the last pharyngeal arch of jawless fishes. C. the circular mouth of lampreys. D. the third pharyngeal arch of jawless fishes. E. the claspers.