The initial degradation of cellulose that initiates microbial growth in the Winogradsky column is carried out by ________.
A. Desulfovibrio
B. Rhodopseudomonas
C. cyanobacteria
D. Clostridium
Answer: D
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Over time, knowledge and information have become an important factor in determining levels of economic development
Indicate whether this statement is true or false.
Which of the following is a reason to graft
plants?
a. to maintain the quality of a plant b. to increase the hardiness of a plant c. to avoid plant diseases d. to produce seedless fruits e. all of these are reasons to graft plants
If chlorophyll a is blocked from absorbing light, what would be the effect on the ability of the plant to do photosynthesis?
A. The plant's ability to carry out photosynthesis will be unchanged, as one of the accessory pigments can fill in for chlorophyll a. B. The plant will have a decreased ability to carry out light-dependent reactions. C. The plant will have an enhanced ability to carry out light-dependent reactions. D. The plant will have an enhanced ability to carry out light-independent reactions.
In a forest, trees that grow taller receive more sunlight and end up producing more viable seeds. Shorter trees of the same species receive less sunlight and produce few viable seeds. Over time, what type of selection will take place?
A. disruptive selection B. directional selection C. stabilizing selection D. sexual selection E. artificial selection