Q: What is the term for the dark brown or black coating found on exposed desert rocks, which is formed of iron and manganese oxides? Read this paragraph and choose the correct option from the provided answers: Exposed rocks in desert areas often develop a dark brown or black coating called desert varnish ( Figure below ). Wind transports clay-sized particles that chemically react with other substances at high temperatures. The coating is formed of iron and manganese oxides. Choices: - desert patina - desert shadow - desert rust - desert varnish A:
desert varnish
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Q: What do sharks use to secrete salt to assist in osmoregulation? Read this paragraph and choose the correct option from the provided answers: animals exposed to similar levels of urea. Sharks are cartilaginous fish with a rectal gland to secrete salt and assist in osmoregulation. Choices: - ceramic gland - bladder gland - blood gland - rectal gland A:
rectal gland
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Q: Categorized based on how they produce their mrna using the baltimore classification method, what consist of a nucleic acid core surrounded by a protein capsid with or without an outer lipid envelope? Read this paragraph and choose the correct option from the provided answers: CHAPTER SUMMARY 21.1 Viral Evolution, Morphology, and Classification Viruses are tiny, acellular entities that can usually only be seen with an electron microscope. Their genomes contain either DNA or RNAnever bothand they replicate using the replication proteins of a host cell. Viruses are diverse, infecting archaea, bacteria, fungi, plants, and animals. Viruses consist of a nucleic acid core surrounded by a protein capsid with or without an outer lipid envelope. The capsid shape, presence of an envelope, and core composition dictate some elements of the classification of viruses. The most commonly used classification method, the Baltimore classification, categorizes viruses based on how they produce their mRNA. Choices: - bacteria - amphibians - parasites - viruses A:
viruses
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Q: A virus is essentially dna or rna surrounded by a coat of what? Read this paragraph and choose the correct option from the provided answers: The answer is actually "no. " A virus is essentially DNA or RNA surrounded by a coat of protein ( Figure below ). It is not made of a cell , and cannot maintain a stable internal environment ( homeostasis ). Recall that a cell is the basic unit of living organisms. So if a virus is not made of at least one cell, can it be living? Viruses also cannot reproduce on their ownthey need to infect a host cell to reproduce. So a virus is very different from any of the organisms that fall into the three domains of life. Choices: - acids - paint - organism - protein A:
protein
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