In contrast to ionic bonds, covalent bonds ____
a. hold atoms together
b. have distinct, three-dimensional forms
c. transfer electrons from one atom to another
d. are rarely broken
e. are transient
ANSWER: b
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A mixed solution of water and small molecules is exposed to a cell membrane and allowed to interact for an hour. Which molecule would be most likely to cross the phospholipid bilayer without the aid of transport proteins and diffuse across the membrane the fastest?
A. Water B. NH4+ C. NH3 D. CH3COO- E. Na+ Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about diffusion? What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The embryo develops from cells of the
a. blastocyst outer layers. b. blastocyst inner cell mass. c. gastrula mesoderm. d. gastrula ectoderm. e. gastrula endoderm
Which of the following statements about epithelial tissue is NOT true?
A. Epithelium lining the respiratory tract contains cilia that move particles along its surface. B. Pseudostratified epithelium looks like it has multiple layers, but all the cells are attached to the basement membrane. C. Columnar epithelium is cube-shaped with the nucleus near the upper surface of the cells. D. Squamous epithelium is composed of flattened cells. E. Simple epithelia have only a single layer of cells.
A lichen is a mutualistic relationship between a fungus and an alga
Indicate whether the statement is true or false