Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 28, Problem 9TYU
WRITE ABOUT A THEME: INTERACTIONS Organisms interact with each other and the physical environment. In a short essay (100–150 words), explain how the response of diatom populations to a drop in nutrient availability can affect both other organisms and aspects of the physical environment (such as carbon dioxide concentrations).
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Describe at least one adaptation that allows a) planktonic organisms such as diatoms or jellyfish to stay in the photo zone (where light penetrates the water), and b) marine birds to thrive in the salt marsh/tidal environment.
In the diagram below, identify the structures of a cyanobacterial cell based on the following descriptions:
a) Outer cellular covering which includes:
Mucilaginous layer – outermost layer covering the cell wall; protects the cell from harmful factors of the environment
Cell wall – found just below the mucilaginous layer; 2 or 3-layered, the inner layer lies in between the outer wall layer and plasma membrane; the outer layer is made of peptidoglycan
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b) Cytoplasm – found below the plasma membrane; the protoplasm which contains structures of different shapes and functions. Lamellae, which contain pigments such as chlorophylls, carotenes, xanthophylls, phycoerythrin and phycocyanin, are located in the peripheral region of cytoplasm. Ribosomes may also be found scattered in the cytoplasm.
c) Nucleic material – the nucleoplasm that is centrally located in the cell and contains chromatin in the form…
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Chapter 28 Solutions
Campbell Biology
Ch. 28.1 - Cite at least four examples of structural and...Ch. 28.1 - Summarize the role of endosymbiosis in eukaryotic...Ch. 28.1 - Prob. 3CCCh. 28.2 - Why do some biologists describe the mitochondria...Ch. 28.2 - WHAT IF? DNA sequence data for a diplomonad, a...Ch. 28.3 - Explain why forams have such a well-preserved...Ch. 28.3 - WHAT IF? Would you expect the plastid DNA of...Ch. 28.3 - Prob. 3CCCh. 28.3 - Prob. 4CCCh. 28.4 - Contrast red algae and brown algae.
Ch. 28.4 - Why is it accurate to say that Ulva is truly...Ch. 28.4 - Prob. 3CCCh. 28.5 - Contrast the pseudopodia of amoebozoans and...Ch. 28.5 - Prob. 2CCCh. 28.5 - Prob. 3CCCh. 28.6 - Justify the claim that photosynthetic protists are...Ch. 28.6 - Prob. 2CCCh. 28.6 - WHAT IF? High water temperatures and pollution...Ch. 28.6 - MAKE CONNECTIONS The bacterium Wolbachia is a...Ch. 28 - Describe similarities and differences between...Ch. 28 - What evidence indicates that the excavates form a...Ch. 28 - Prob. 28.3CRCh. 28 - On what basis do systematists place plants in the...Ch. 28 - Describe a key feature for each of the main...Ch. 28 - Prob. 28.6CRCh. 28 - Plastids that are Surrounded by more than two...Ch. 28 - Biologists think that endosymbiosis gave rise to...Ch. 28 - Prob. 3TYUCh. 28 - According to the phylogeny presented in this...Ch. 28 - In a life cycle with alternation of generations,...Ch. 28 - Based on the phylogenetic tree in Figure 28.2,...Ch. 28 - Prob. 7TYUCh. 28 - SCIENTIFIC INQUIRY Applying the If then logic of...Ch. 28 - WRITE ABOUT A THEME: INTERACTIONS Organisms...Ch. 28 - SYNTHESIZE YOUR KNOWLEDGE This micrograph show's a...
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- . This flowchart helps distinguish among organisms by asking questions that have one of two possible answers. As a result, this flowchart can also be called a dichotomous key (from Greek dikho- 'in two' + temnein 'to cut'). Complete the flowchart by properly placing these genera: Bacillus, Corynebacterium, Escherichia, Mycobacterium, Neisseria, and Staphylococcus. You may need to look up additional information about these genera. Gram reaction Rod-shaped Negative Coccus-shaped Rod-shaped Positive Coccus-shaped Acid-fast Not acid-fast Spore-former No sporesarrow_forwardTo describe: The major ecological role played by single-celled algae.arrow_forwardIs oxygen a requirement for the growth of all organisms? Describe the following in terms of oxygen need.arrow_forward
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