Neurotransmitters transmit action potentials across a(n) ____ in the form of a(n) ____
a. axon terminals; chemical signal
b. dendrites; chemical signal
c. neuronal cell bodies; electrical signal
d. the cytoplasm of axons; potential energy source
e. dendritic vesicles; trigger potential
ANSWER: a
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During which stage of meiosis will the pairs of homologous chromosomes line up?
A) metaphase I B) metaphase II C) metaphase D) anaphase I E) prophase II.
Cytokinesis in plants occurs as ________ and in animals as ________.
A) actin fibers pull the membrane inward until the two sides touch; the Golgi apparatus produces membrane-bound vesicles filled with materials to make the cell wall B) the Golgi apparatus produces membrane-bound vesicles filled with materials to make the cell wall; actin fibers pull the membrane inward until the two sides touch C) the centrosome produces membrane-bound vesicles filled with materials to make the cell wall; the Golgi apparatus produces actin fibers to pull the membrane inward until the two sides touch D) actin fibers interact to make the cell wall; the cleavage furrow pulls the membrane inward until the two sides touch E) the Golgi apparatus produces a cleavage furrow; actin fibers pull the membrane inward until the two sides touch
There are greenhouse gases other than CO2, including methane (CH4) and nitrous oxide (N2O), which have potential to influence changes in Earth's climate
Compare the graphs shown below measuring CO2 levels and N2O levels in the atmosphere between 1978 and 2010. CO2 plays a role in the carbon cycle, whereas N2O is a product of the nitrogen cycle. The latter results primarily from agricultural practices that utilize nitrogen-based fertilizers. Because N2O stays in the atmosphere for about 120 years before undergoing a biochemical conversion or being removed by a reservoir, the impact of one pound of N2O on the warming of Earth's atmosphere is over 300 times that of the equivalent amount of CO2 http://www.epa.gov http://www.epa.gov. Thus, it becomes important to understand atmospheric gas trends and take these results into account when making decisions about human activities detrimental to Earth's climate. Reference: Ref 25-6 While both graphs show an upward trend, N2O levels (right panel) do not oscillate annually like CO2 levels (left panel). What may account for this difference? Select all plausible choices. What will be an ideal response?
What critical role is often played by pigs in the epidemiology of influenza virus?
A. Pigs are the reservoir for influenza virus and most humans become infected by contact with respiratory secretions of pigs. B. Pigs are the reservoir for influenza viruses and disease can be transmitted to humans by consuming undercooked pork. C. Pigs harbor influenza viruses that are much more virulent than avian strains and human strains. D. Pigs can become infected simultaneously with both human, avian, and swine varieties of influenza viruses, providing an opportunity for genetic recombination resulting in antigenic drift.