Which of the following statements correctly describes the alternation of generations in a plant life cycle?
A) Diploid sporophytes that produce spores by meiosis alternate with haploid gametophytes that produce gametes by mitosis.
B) Diploid sporophytes that produce gametes by meiosis alternate with haploid sporophytes that produce gametes by mitosis.
C) Diploid gametophytes that produce spores by mitosis alternate with haploid sporophytes that produce gametes by meiosis.
D) Diploid gametophytes that produce gametes by meiosis alternate with haploid sporophytes that produce spores by mitosis.
Answer: A
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The Gram-negative chlamydiae are ________.
A. motile due to periplasmic flagella B. Gram-positive, spore-forming rods C. photosynthetic D. obligate intracellular parasites
How is DNA introduced into plants using the Ti plasmid?
a. The gene of interest remains in the Ti plasmid after the plasmid has transformed the plant, and the gene is expressed in the plant. b. The Ti plasmid inserts the gene of interest directly into the plant's nuclear DNA. c. The entire Ti plasmid including the gene of interest is inserted into the plant’s nuclear DNA. d. The Ti plasmid inserts the foreign DNA into the plant's chloroplast DNA. e. The Ti plasmid inserts the foreign DNA into the plant's mitochondrial DNA.
Which level of biological organization is composed of tissues?
(a). organism (b). organ system (c). organ (d). cell (e). molecules
A small number of cell surface receptors can ultimately generate a large intracellular response due to activation of kinase cascades. This is referred to as:
A. signal transduction. B. signal dampening. C. signal activation. D. signal amplification.