Where would a coral reef most likely be found?
A) In the oceanic benthic realm below the continental shelf
B) In an estuary
C) In the deep sea
D) In the oceanic photic zone
D
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HBV is mainly spread by
A. blood. B. blood products. C. semen. D. saliva. E. blood, blood products AND semen.
In Drosophila, germ cells develop from pole nuclei isolated from the rest of the embryo at the posterior end. How are they "protected" from the effects of posterior concentrations of zygote-produced mRNAs and proteins?
A) Their genes have unresponsive promoters. B) The cytoplasm at the pole is separated by a compartmentalizing membrane. C) The pair-rule, gap, and segmentation genes are not expressed in these cells. D) Homeotic genes in these cells are inhibited by zygotic genes from the mother. E) Paternal effects operate on the embryo only in the pole cells.
How do Na+ ions enter a neuron when an action potential is initiated
a) a voltage-gated Na+ facilitated transporter b) a voltage-gated Na+ channel c) the Na+/K+aATPase d) a gated Na+ pump e) the ligand-gated Na+ channel
Drinking water is disinfected by ALL of the following methods prior to release EXCEPT
a. addition of sodium hypochlorite. b. UV radiation. c. addition of hydrogen peroxide. d. addition of chlorine gas.