In obesity studies in mice, the binding of leptin activates the leptin receptor and initiates changes in ____ in the
hypothalamus.
a. nucleotide sequences
b. cell membranes
c. mitochondria
d. fat storage
e. gene expression
e
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_______ is a genus of protist whose secondary host is a mouse and primary host is a cat. This parasitic protist, however, can infect a human fetus by crossing the placental barrier, ultimately causing brain damage.
a. Plasmodium b. Paramecium c. Trypanosoma d. Giardia e. Toxoplasma
The net ATP production in glycolysis is only two because
A. two ATPs are used to "activate" glucose, while four ATPs are produced in remaining glycolysis steps. B. two ATPs are used to donate electrons, in order to move NADH into the mitochondria. C. that is all the ATPs "loaded" with phosphates during glycolysis. D. that is the needed number of ATPs to power the reactions of the Krebs cycle. E. None of the answer choices is correct
These types of repeating genes are copied from one chromosome and moved as a set to another chromosome and allow for genetic back-ups of information.
A. segmental duplications B. tandem clusters C. repeating clusters D. translocation mutations
A pollination syndrome is
A. a brushlike tongue of hummingbirds to which pollen adheres. B. the synchronous release of pollen by many individuals of wind-pollinated trees. C. a series of bristles on the backs of insects to which pollen adheres. D. the simultaneous release of two sperm, one to affect fertilization and the other to initiate formation of endosperm. E. specializations of plants that attract a specific kind of pollinator.