Heart-shaped gametophytes produce swimming sperm; leaves of sporophytes develop from fiddleheads.
a. Mosses
b. Ferns
c. Conifers
d. Gingkos
e. Angiosperms
Answer: b. Ferns
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In the ocean, organic matter sinks from the surface to great depths as ________.
A. particulate debris B. marine snow C. photosynthetic potential D. None of the choices are correct.
Answer the following statements true (T) or false (F)
1. The Nernst Equation is: E = 60 mV log10 ([Xextracellular/Xintracellular]). Given this, the equilibrium potential for a given ion would be increased with an increase in its intracellular concentration. 2. Action potentials are typically also characterized as graded potentials. 3. Saltatory conduction is often studied in large marine invertebrates such as the giant squid. 4. The exposed, unmyelinated gaps between glia on myelinated axons are also sites of voltage-gated Na+ channels.
RNA is believed to have preceded DNA because _____.
A. DNA contains thymine and RNA does not. B. DNA is double stranded and requires more components. C. DNA can store more protein-building instructions in less space. D. RNA can also function as an enzyme. E. RNA cannot replicate itself.
In addition to highly repetitive and unique DNA sequences, a third category of DNA sequences exists. What is it called, and what types of elements are involved in it?
A) dominant DNA; euchromatin and heterochromatin B) multiple gene family DNA; hemoglobin and 5.0S RNA C) moderately repetitive DNA; SINEs, LINEs, and VNTRs D) permissive DNA; centromeres and heterochromatin E) composite DNA; telomeres and heterochromatin