Sodium has one valence electron in its third energy level. To reach a stable energy configuration, sodium will tend
to____.
a. take up an electron from another atom
b. move its valence electron to the second energy shell
c. give up an electron to another atom
d. share its valence electron with another atom
e. move an electron from the second energy level to the valence shell
ANSWER: c
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The relationship between photosystem I (PSI) and photosystem II (PSII) is correctly described by which of the following statements?
A) PSI absorbs only short wavelengths of light. B) Electrons are excited by PSI or PSII, but not both. C) PSI is designated P700, whereas PSII is designated P680. D) The absorption maximum of PSII is 700 nm. E) The absorption maximum of PSI is 680 nm.
Which one of the following explanations does not describe why generating transgenic animals is more difficult than plants?
A) The intracellular environment of an animal can be much different than bacteria and even plants. B) Animal cells do not readily take up plasmid DNA like plant cells. C) The techniques for cloning animals from a single cell are more challenging than for plants. D) Genetic material must be inserted into a fertilized egg, then implanted into a living animal; plants can be grown in culture media, and thus, there is no need for implantation. E) Genetic material is introduced to animal cells in culture media and the animal is allowed to mature in the culture media.
What anatomical part of polychaetes can be used for both locomotion and feeding?
A. Gills B. Bivalves C. Tentacles D. Trochophore E. Parapodia
Pure cultures are often obtained by isolating
A) streaks. B) broths. C) CFUs (colony forming units). D) inoculums. E) specimens.