Which of the following bacteria in the gut of termites contains genes encoding nitrogenase?
a. Roseobacter denitrificans
b. Ruegeria pomeroyi
c. Treponema spirochetes
d. Escherichia coli
Answer: C
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Which of the following most correctly describes the whole-genome shotgun technique for sequencing a genome?
A) genetic mapping followed immediately by sequencing B) physical mapping followed immediately by sequencing C) cloning large genome fragments into very large vectors such as YACs, followed by sequencing D) cloning fragments from many copies of an entire chromosome, sequencing the fragments, and then ordering the sequences E) cloning the whole genome directly, from one end to the other
Draw a rooted phylogenetic tree containing seven organisms labeled A to G. Label your tree with the following terms: branches, extant taxa, nodes, last common ancestor, and an outgroup
What will be an ideal response?
Referring to the figure of sperm penetration and fusion, match the lettered description with the correct numbered step in the figure.
A. Some of the zona pellucida is degraded by acrosomal enzymes.
B. Enzymes are released by cortical granules that harden the zona pellucida.
C. Sperm and egg fuse at the plasma membrane.
D. Sperm penetrates the corona radiata.
E. The sperm nucleus dissociates and enters the cytoplasm.
F. Additional sperm can no longer penetrate.
1. Step I
2. Step II
3. Step III
4. Step IV
5. Step V
6. Step VI
The above figure of goslings (baby geese)
following their mother demonstrates a. imprinting behavior. b. displaying instinctive behavior. c. feeding a social parasite. d. a learned behavior. e. all of these