Which of the following molecules would not easily diffuse across a plasma membrane?
A. small polar molecules
B. large polar molecules
C. gases
D. both small and large polar molecules
Answer Key: B
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When MAR is combined with FISH, one can analyze the phylogenetic identity and the specific substrate uptake patterns of microbes of interest at the level of a single cell in complex microbial communities.
Answer the following statement true (T) or false (F)
Which one of the following statements about the phylum Brachiopoda is false?
A. Brachiopods are often misidentified as bivalves. B. Brachiopods were much more diverse in the past. C. As in bivalves, the valves in brachiopods are lateral (left and right) to the body axis. D. Most brachiopods are sessile (attached). E. The lophophore resides within the brachiopod's shells.
Some Drosophila developmental genes result in the loss of alternate segments in the larva when mutated. These genes
are called:a. embryonic segment genes. b. larval segmentation genes. c. segment polarity genes. d. pair-rule genes. e. gap genes.
Fatty acids are
A) composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio. B) composed of carbon, hydrogen, glycerol, and a phosphate group. C) composed of hydrocarbon chains and a carboxyl group. D) composed of four linked rings.