Which event occurs during a strong El Niño year?
a. light rains in the central and eastern Pacific ocean
b. upwelling of cold water in the western Pacific ocean
c. death of phytoplankton in western coastal areas
d. cold surface currents flowing from west to east
e. strengthened equatorial winds
ANSWER: c
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Match the following items to the correct phrase.
_______1. Bacteria without cell walls. _______2. Acid-fast bacteria. _______3. Curved, Gram-negative bacilli. _______4. Spore-forming bacteria. _______5. Bacteria having complex nutritional requirements. a. Fastidious bacteria b. Mycoplasma spp. c. Clostridium and Bacillus spp. d. Mycobacterium and Nocardia spp. e. Vibrio species
If drugs are less effective when taken together than when each is taken separately, they are called
A. energetic. B. antagonistic. C. additive. D. synergistic.
Which of the following is typically a symptom of systemic mycoses?
a. respiratory difficulties b. itchy skin c. allergic reactions d. yeast infections
Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. The relationship between genes S and N is an example of _____.
A) incomplete dominance B) epistasis C) pleiotropy D) codominance