The water molecule is formed from two hydrogen atoms and one oxygen atom. Which type of force attracts one water molecule to another?
A) ionic bond
B) hydrogen bond
C) polar covalent bond
D) nonpolar covalent bond
Ans: B) hydrogen bond
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Gravitropism is defined as:
A. growth in response to the Earth's magnetic field B. gravity's pull on certain plant organs C. growth in response to the force of gravity D. any response to gravity that changes cell structures E. growth mostly away from gravity
Answer the question using the accompanying figure. In the figure, letter A represents a ____ taxon, which includes ____
a. polyphyletic; species from different evolutionary lineages
b. polyphyletic; an ancestral species and all of its descendants c. paraphyletic; an ancestral species and only some of its descendants d. monophyletic; species from different evolutionary lineages e. monophyletic; an ancestral species and all of its descendants
Ultraviolet irradiation is frequently used to sterilise medical supplies such as plastic tubing
a. true b. false
True or False: Lipopolysaccharide, bacterial flagellin, and lipoteichoic acids are examples of pathogen-associated molecular patterns (PAMPs)
a. TRUE b. FALSE