Explain how the sexual life cycle of flowering plants is adapted to the terrestrial environment.
What will be an ideal response?
Answers may vary. The sexual life cycle of flowering plants is adapted to the terrestrial environment. The female gametophyte develops completely within the sporophyte and is therefore protected from desiccation. In addition, pollen grains are not released until they develop a thick wall, which also protects them from desiccation and other environmental hazards. Unlike algae, nonvascular plants and fern, angiosperms require no external water for fertilization. The pollen tube provides a safe passage of sperm to the egg and polar nuclei. This is an advantage that allows the plant to grow in the drier, terrestrial environment. After fertilization, the embryo is protected inside of a seed and is provided nutrients from the endosperm until external conditions are favorable for germination.
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Which RNA must be removed from a sample before performing RNA-Seq?
A. mRNA B. tRNA C. rRNA D. snRNA E. 16S rRNA only
Antibodies are shaped like the letter
a. C. b. E. c. H. d. K. e. none of these.
The event in human history that changed the natural balance of the carbon cycle was the:a
Industrial Revolution b. Agricultural Revolution c. evolution of primates d. invention of farming e. invention of the telegraph
Endospores
A) are bacterial reproductive structures. B) may be produced when nutrients are scarce. C) are produced by bacteria, algae, and fungi. D) are resistant to everything except radiation. E) can last for only about 10 years.