Q: Q: Viroids are plant pathogens much simpler than what, but like them can reproduce only within a host cell? Read this paragraph and choose the correct option from the provided answers: Viroids Viroids are plant pathogens: small, single-stranded, circular RNA particles that are much simpler than a virus. They do not have a capsid or outer envelope, but like viruses can reproduce only within a host cell. Viroids do not, however, manufacture any proteins, and they only produce a single, specific RNA molecule. Human diseases caused by viroids have yet to be identified. Viroids are known to infect plants (Figure 21.18) and are responsible for crop failures and the loss of millions of dollars in agricultural revenue each year. Some of the plants they infect include potatoes, cucumbers, tomatoes, chrysanthemums, avocados, and coconut palms. Choices: - pests - bacteria - parasites - viruses A:
A: viruses

Q: Q: What do you call mixtures of ash and water that travel down river valleys? Read this paragraph and choose the correct option from the provided answers: Lahars are mixtures of ash and water that travel down river valleys. On Mount St. Helens, the eruption melted glaciers. The water mixed with ash from the eruption and created tremendous lahars. The lahars raced down valleys and knocked out many bridges. Choices: - debris - pollutants - mud slides - lahars A:
A: lahars

Q: Q: What molecule consists of two atoms of hydrogen and one atom of oxygen? Read this paragraph and choose the correct option from the provided answers: Water is an example of a common chemical compound. As you can see in the Figure below , each water molecule consists of two atoms of hydrogen and one atom of oxygen. Water always has this 2:1 ratio of hydrogen to oxygen. Like water, all compounds consist of a fixed ratio of elements. It doesn't matter how much or how little of a compound there is. It always has the same composition. Choices: - carbon monoxide - hydrogen peroxide - air - water A:
A: water

Q: Q: What is the energy of motion called? Read this paragraph and choose the correct option from the provided answers: Choices: - binary energy - potential energy - mixed energy - kinetic energy A:
A: kinetic energy