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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

Pollen grains are produced directly by

a. carpels. b. mitosis. c. meiosis. d. stigmas. e. pollen sacs

Biology & Microbiology