To observe the three-dimensional structure of a cell the best type of microscopy would be
A. scanning electron microscopy.
B. fluorescence microscopy.
C. standard light microscopy.
D. differential-interference light microscopy.
E. transmission electron microscopy.
Answer: A
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The presence of genes encoding RubisCO enzymes in Methanocaldococcus jannaschii and a species of Pyrococcus indicates that the organisms
A) incorporate carbon dioxide via the acetyl-CoA pathway. B) incorporate carbon dioxide via the Calvin cycle. C) incorporate carbon dioxide via the reverse citric acid cycle. D) utilize molecular hydrogen as an electron donor in chemolithotrophic metabolism.
Microtubules and microfilaments differ with respect to each of the following except
A) size. B) occurrence. C) associated motor proteins. D) a state of dynamic instability. E) subunits.
Some bacteria have membranes around their
DNA. What is lacking in these membranes that we do not call them nuclei?
a. pores b. proteins c. phospholipids d. a bilayer construction e. more than one of these is lacking
When a population shows a range of nonincremental differences in some trait, they are showing
a. continuous variation. b. pleiotropy. c. linear variation. d. exponential variation. e. skewed variation.