What evidence would support the hypothesis that larger cells evolved in part by engulfing other, smaller cells?
What will be an ideal response?
Eukaryotic cells have several organelles (nucleus, mitochondria, chloroplasts) that contain a double membrane and have their own DNA. The DNA of the mitochondria and chloroplasts are arranged in plasmids, resembling the DNA of bacteria. They even divide like bacteria. Their smaller size, double walls and plasmid DNA suggest they were absorbed by endocytosis, but instead of being digested, they were assimilated as powerhouse organelles. The symbiotic relationship evolved to the point where they became a single organism. Additionally, the smaller and simpler prokaryotic cells were on the planet for 2 billion years before the larger, more complex eukaryotic cells appeared, giving them sufficient time to evolve.
You might also like to view...
Blood cultures are drawn on a patient suspected of having a fungemia. Positive cultures reveal the presence of chlamydoconidia on cornmeal agar. In addition, the yeast is germ tube positive. The most likely identification of the fungal agent is:
a. C. glabrata. b. C. tropicalis. c. C. neoformans. d. C. albicans.
A mixture of DNA fragments is amplified from a sample of ocean water. Which gene(s) could be definitively categorized as originating from a species of animal?
A. Genes for ATP synthase B. Genes for RuBisCO C. Gene for Spongin D. Cell cycle regulatory genes E. Genes for biosynthesis of chitin Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about animal genes? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process ·Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The stage of viral replication in which viral components are put together to form new viruses is:
a. Release b. Assembly c. Attachment d. Penetration e. Synthesis
Discuss the problems with development of antifungal, antiprotozoan, antihelminth, and antiviral drugs compared to the antibacterial drugs. Discuss at least 3 different modes of action that have been developed for these drugs.
What will be an ideal response?