Which of the following describes the property shared by elements within the same column (or group) in the periodic table of elements?
a. Elements within the same group have the same electrical charge.
b. Elements within the same group have the same number of neutrons in their nuclei.
c. Elements within the same group share the same electron configuration in their valence shells.
d. Elements within the same group have the same atomic radius.
c. Elements within the same group share the same electron configuration in their valence shells.
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The most heavily colonized human organ by bacteria is the ________, containing 1011-1012 bacterial cells per g
A) mouth B) small intestine C) large intestine D) skin
The person who performed an experiment that proved that amino acids could be produced in the laboratory from a reducing atmosphere and electrical sparks was
A. Stanley Miller. B. Graham Cairns-Smith. C. Thomas Cech. D. Aleksander Oparin. E. Sidney Fox.
Gehring tested the hypothesis that the Pax6 gene acts as a master regulator of eye development by engineering Drosophila Pax6 genes to be expressed in Drosophila antennae. What happened, and did it support or refute his hypothesis?
A. A compound eye developed on the antenna; this supports the hypothesis. B. A compound eye developed on the head; this supports the hypothesis. C. The antenna developed normally; this falsified the hypothesis. D. The antenna developed where the eye normally would be; this supports the hypothesis. E. The antenna developed where the eye would normally be; this falsified the hypothesis.
Canadian researchers found that loud noise had
which of the following effects on a local songbird? a. 20% reduction in weight gain b. 15% fewer offspring c. 10% increase in external parasites d. 39% more male offspring e. none of these