Why are gymnosperms considered to be "naked seed" plants?
A) Their seeds have a thin layer of endosperm.
B) They do not produce seeds; they produce only spores.
C) Their seeds are not enclosed within ovaries.
D) Their seeds develop on the surface of sporophytes.
C) Their seeds are not enclosed within ovaries.
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When the squid that contain luminescent bacterial symbionts hatch, they do NOT contain a bacterial symbiont. Symbiont transmission in this symbiosis is
A) vertical from parent to offspring. B) horizontal and involves specific selection of the symbiont from the environment. C) random and results in various different species being selected as the symbiont. D) mixed and results in multiple symbiont species colonizing the squid at once.
Which of the following is not true of the outer membrane?
A. Gram-positive bacteria have an outer membrane. B. The lipid portion of the lipopolysaccharide layer is termed endotoxin. C. Porins create channels through the outer membrane. D. The innermost layer is a phospholipid bilayer. E. The uppermost layer is made of lipopolysaccharide.
Which type of stem cell is most able to produce a new individual?
a. unipotent b. regenerative c. pluripotent d. totipotent e. adult stem cells
The functions of the nasal conchae are to enhance the air turbulence in the cavity and to increase the mucosal surface area exposed to air for greater efficiency.
Indicate whether the statement is true or false