Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337670319
Author: STARR
Publisher: Cengage
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Chapter 20, Problem 7SQ
Summary Introduction
Introduction: Cyanobacteria (blue-green algae) are one of the most primordial bacteria on earth. They generate oxygen throughout photosynthetic reaction. They can utilize the carbon dioxide present in the water and photosynthetically make their own food by releasing oxygen into the environment.
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Plantlike photosynthesis that releases O2 occurs in (A) cyanobacteria. (B) archaea. (C) gram-positive bacteria. (D) chemoautotrophic bacteria.
______carry out oxygen-releasing photosynthesis. a. Spirochetes c. Cyanobacteria b. Chlamydias d. Proteobacteria
Atmospheric nitrogen can be useda) directly by all living organisms.b) only by aerobic bacteria.c) only by anaerobic bacteria.d) in symbiotic relationships between rhizobia and plants.e) in photosynthesis.
Chapter 20 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 20 - Bacteriophage-Inspired Antibiotics Although...Ch. 20 - Bacteriophage-Inspired Antibiotics Although...Ch. 20 - Bacteriophage-Inspired Antibiotics Although...Ch. 20 - The genome of ___ can be either RNA or DNA. a. a...Ch. 20 - The capsid of a virion consists of ___ . a. DNA b....Ch. 20 - Bacteriophages kill their host quickly by ______ ....Ch. 20 - The genetic material of HIV (a retrovirus) is...Ch. 20 - Prob. 5SQCh. 20 - Prob. 6SQCh. 20 - Prob. 7SQ
Ch. 20 - Bacteria that serve as decomposers are ___ . a....Ch. 20 - Prob. 9SQCh. 20 - Formation of a(n) ___ allows some soil bacteria to...Ch. 20 - _____ in the stomach of a cow release methane. a....Ch. 20 - A plasmid is a circle of ___ . a. RNA b. DNA c....Ch. 20 - Prob. 13SQCh. 20 - Prob. 14SQCh. 20 - Prob. 15SQCh. 20 - Prob. 1CTCh. 20 - Adenoviruses that cause colds do not have a lipid...Ch. 20 - The antibiotic penicillin acts by interfering with...Ch. 20 - Raw red alga of the genus Porphyra is part of a...
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- _______ are oxygen-releasing photoautotrophs. a. Spirochetes c. Cyanobacteria b. Methanogens d. Bacteriophagesarrow_forwardMitochondria most likely evolved from_______. a. a photosynthetic cyanobacterium b. cytoskeletal elements c. aerobic bacteria d. membrane proliferationarrow_forwardThe first organisms that oxygenated the atmosphere were ______. a. cyanobacteria b. phootrophic organisms c. anaerobic organisms d. allof the abovearrow_forward
- Virusesa. are usually photosynthetic.b. consist of a single cell.c. consist of DNA or RNA and a protein coat.d. consist of ATP and a lipid coat.arrow_forwardCyanobacteria harness energy from the sun through photosynthesis, and oxidize water to provide electrons for energy generation. Thus, we classify cyanobacteria as _________. a. photolithotrophs b. photoautotrophs c. chemolithoautotrophs d. chemo-organotrophsarrow_forwardWhen conditions are unfavorable, some bacteria: a. Become non pathogenic b formspores, a resting stage c switch to photosynthesis d Become pathogenic e engage in conjugationarrow_forward
- Bacteria that are autotrophs (a) do not require atmospheric oxygen for cellular respiration (b) must obtain organic compounds from other organisms (c) manufacture their own organic molecules from simple raw materials (d) get their nourishment from dead organisms (e) produce endospores when oxygen levels are too low for active growtharrow_forwardA scientist claims that the Presence of aquaporins is in chloroplast membrane support that Endosymbiotic theory?arrow_forwardPlants cannot fix nitrogen, yet some plants do NOT need nitrogen from the soil. This is because a. of a symbiotic association with a bacterium that can fix nitrogen. b. these plants are the exceptions that can fix nitrogen. c. they have been infected by a parasitic virus that can fix nitrogen. d. they are able to obtain nitrogen from the air.arrow_forward
- Although they are not photosynthetic, apicomplexan parasites such as Plasmodium have modified plastids. Describe a current hypothesis that explains this observationarrow_forwardProkaryotes that obtain their energy from chemical compounds are called _____. a. photorophs b. auxotrophs c. chemorophs d. lithotrophsarrow_forwardIf an organisms that is a mixotroph loses its plastids, it survives because A. It has an endospore and becomes dormant until conditions improve B. It has photosystesis by membranes present in the cytoplasm C. since it is also a heterotroph engulfs organic material by phagocytosis or by absorption for nutrition D. uses mitochondria that acquite after loosing its plastidsarrow_forward
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