Which one of the following structures seen here is present in both the plant and the animal cell?
1.golgi body
2.cell wall
3.chloroplasts
4.central vacuole
1
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At the molecular level, the "choice" between lytic and lysogenic pathways is determined by:
A. the positive regulatory effects of a large number of bacteriophage proteins produced soon after infection. B. the negative regulatory effects of a large number of bacteriophage proteins produced soon after infection. C. the positive regulatory effects of a small number of bacteriophage proteins produced soon after infection. D. the negative regulatory effects of a small number of bacteriophage proteins produced soon after infection. E. the positive and negative regulatory effects of a small number of bacteriophage proteins produced soon after infection.
Comparative embryology helped clarify the relationships among major groups of animals. The bilaterians, for example, can be divided into the _____ based on the developmental fate of the blastopore
A. protostomes and deuterostomes B. coelomates and acoelomates C. coelomates and pseudocoelomates D. cnidarians and radiolarians E. protostomes and coelomates
You find some rather strange plants in your backyard. They consist only of thin, pale yellow stems that are wrapped around other species of plants growing nearby. You experiment by unwrapping some of the strange yellow plants and planting half of them alone in pots of soil and half in pots with other plants from your yard. You water and fertilize both sets of pots, but after a few weeks you find that the yellow plants that were potted alone have died, while those potted with other plants are thriving. What term would you use to describe the strange yellow plants?
A. asexual B. holoparasitic C. monophagous D. aposematic E. hemiparasitic
The part of the top soil that is characterized by its spongy organic matter that is chemically complex and hard to break down is
A. topsoil. B. creosote. C. humus. D. clay. E. silt.