What is the first step in energy flow through an ecosystem?
a. Top-level carnivores eat the herbivores or omnivores within the ecosystem.
b. Producers absorb solar energy.
c. Producers absorb nutrients from the soil.
d. Producers are eaten by the herbivores.
e. Decomposers break down the organic matter and make it available for the producers.
Ans: b. Producers absorb solar energy.
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In a dividing plant cell, a phragmoplast structure forms during telophase that directs vesicles carrying cell wall components to the middle of the cell, assembling a new cell wall called the cell plate
A. true B. false
The activated sludge method can be stopped by the presence of toxic industrial wastes
Indicate whether this statement is TRUE or FALSE.
The major criteria used in placing bacteria into different groups is based on differences in
A. cell wall structure. B. cell membrane permeability. C. presence or absence of flagella. D. detergent susceptibility.
What aspect of the DNA molecule is responsible for heritable information?
a. the specific placement of the sugars ribose and deoxyribose b. variations in the patterns of cross-pairings between the bases on opposite sides of the molecule c. variations in the number of adjacent phosphates within the backbone of the molecule d. the sequence of bases