During swallowing, which structure aids the epiglottis in closing off the trachea?
a. the glottis
b. the esophagus
c. the vocal cords
d. the pharynx
e. the soft palate
C
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Because they both produce a reverse transcriptase, long interspersed nuclear elements (LINEs) as transposable elements may be related to _____
A) plasmids B) retroviruses C) poliovirus D) parasitic bacteria E) lower plants
Alternative splicing
_____ results in different proteins in the same family. _____ is important for multicellular organisms with different cell types. _____ results in proteins that can quickly be activated and deactivated. _____ is a gene regulatory mechanism in eukaryotes but not prokaryotes. _____ have pre-RNA that are the same as other genes.
Which feature is not a characteristic of the tropical rain forests? a. Average rainfall of 130 - 200 centimeters
b. The most structurally complex biome. c. Photosynthesis continues year round. d. Average temperature of 92o F. e. Little variation in the length of daylight.
Pollen grains are produced directly by
a. carpels. b. mitosis. c. meiosis. d. stigmas. e. pollen sacs