Which of the following is not considered a photosynthetic organism, and so would not remove atmospheric CO2?
A. kelp
B. elm tree
C. human
D. moss
E. phytoplankton
C
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Allergy is a(n) ____ response to ____ antigens
a. overactive; environmental b. underactive; environmental c. overactive; cellular d. underactive; cellular e. normal level; microbial
Upon closer inspection of the leaves of "flower of stone," one can observe tiny, cone-like structures. Each cone-like structure emits spores of two different sizes
Further investigation also reveals that the roots of "flower of stone" branch only at the growing tip of the root, forming a Y-shaped structure. Based on these additional observations, which of the following can be properly inferred about "flower of stone"? 1. It is heterosporous. 2. It is a fern. 3. The cone-like structures are sori. 4. It is a lycophyte. 5. It has separate male and female gametophytes. A) 1 and 5 B) 2 and 3 C) 1, 2, and 3 D) 1, 4, and 5
Which of the following is not one of the six major kinds of plant hormones?
a. auxin b. nitrogen oxide c. cytokinin d. gibberellin e. ethylene
How do naked viruses differ from enveloped viruses in their attachment/penetration phase?
a. They uncoat after they enter the cell. b. Their DNA attaches to receptors on the cell surface. c. Their protein coat fuses to the cell membrane. d. Their nucleic acids are injected into the cell.