Which stramenopiles are photosynthetic?
a. diatoms only
b. brown algae only
c. water molds only
d. diatoms and brown algae only
e. diatoms, brown algae and water molds
d
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Which term describes a set of organisms that descended from a single common ancestor and are more closely related to other members of the group than to organisms outside the group?
A) paraphyletic group B) phylogeny C) species D) monophyletic group E) parsimony
Ingesting a small number of Clostridium botulinum endospores is generally __________.
A) problematic B) not problematic
Why do electron microscopes have a better resolution versus light microscopes?
A) The additional steps necessary to prepare the sample for viewing provide the improved resolution. B) An electron beam has a wavelength of about 800 nm, and resolution improves with larger wavelengths. C) The lenses, knobs, and strength of the electron beam can all be highly controlled, which also explains why electron microscopes are so expensive. D) An electron beam has a wavelength of about 1 nm, and resolution improves with smaller wavelengths. E) The lenses used to focus the electron beam are more adjustable than the ones in a light microscope.
Which of the following statements about microtubules is true?
(a) Motor proteins move in a directional fashion along microtubules by using the inherent structural polarity of a protofilament. (b) The centromere nucleates the microtubules of the mitotic spindle. (c) Because microtubules are subject to dynamic instability, they are used only for transient structures in a cell. (d) ATP hydrolysis by a tubulin heterodimer is important for controlling the growth of a microtubule.