Even in the absence of sperm, metabolic activity in an egg can be artificially activated by _____
A) abnormally high levels of carbonic acid in the cytosol
B) abnormally low levels of extracellular oxygen
C) injection of calcium ions into the cytosol
D) depletion of its ATP supplies
C
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During a year, plants never use 100% of the incoming solar radiation for photosynthesis. What is a reasonable explanation for this?
I) Plants cannot photosynthesize as well during winter (in cold winter climates). II) Plants cannot photosynthesize as well on cloudy days. III) The pigments that drive photosynthesis respond to only a fraction of the wavelengths that are available. A) only I B) only II C) only III D) only II and III E) I, II, and III
One of the functions of the skeletal system is to store which two minerals?
Which one of the following incorrectly matches a molluscan group with a feature characterizing that group?
A. Gastropoda—torsion B. Nudibranchs—extensive gills in mantle cavity C. Bivalvia—reduced head and no radula D. Polyplacophora—eight calcareous plates E. Cephalopoda—closed circulatory system
When plants are produced by cloning, which process is most directly involved?
a. mitotic cell division b. binary fission c. meiotic cell division d. gamete production e. budding