Choose the letter of the best match from the following:A. protodermB. vascular cambiumC. apical meristemD. procambiumE. ground meristemUltimate source of all cells that contribute to growth in length of stem or root.
Fill in the blank(s) with the appropriate word(s).
Answer: C
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Plasmids are used as vectors in plant and bacterial genetic engineering. However, there is a major difference in the fate of genes introduced into bacteria on most bacterial plasmids and into plants on tumor-inducing (Ti) plasmids. What is this difference
A) In bacteria, genes are stably expressed; in plants, gene expression is always lost quickly. B) Gene expression tends to decrease rapidly and unpredictably in bacteria; gene expression is much more stable in plants. C) Bacterial plasmids are circular DNAs; Ti plasmid DNA is linear. D) Bacterial plasmids and the genes they carry usually are not integrated into the chromosome; Ti plasmids and the genes they carry are integrated into the chromosome. E) Bacterial plasmids typically do not modify the growth of the host cells; Ti plasmids modified for genetic engineering always produce plant galls.
The structure that confers structural strength on the cell is known as the
A) cytoplasmic membrane. B) cell wall. C) ribosome. D) cytoplasm.
Myelinated axons make up the _________ of the brain
A. brain stem B. white matter C. sulci D. gray matter
________ improved the original light microscope in the late 1600s, allowing the visualization of ________
A) Theodor Schwann; the internal structures of cells, such as ribosomes, nuclei, and golgi bodies B) Robert Hooke; bacteria and viruses C) Antonie van Leeuwenhoek; sperm cells, bacteria, algae, and other protists D) Robert Brown; cell structures using fluorescent antibodies E) Rudolf Virchow; collagen and muscle cells