Answer the following question given this paragraph: Besides their strength, another pro of electromagnets is the ability to control them by controlling the electric current. Turning the current on or off turns the magnetic field on or off. The amount of current flowing through the coil can also be changed to control the strength of the electromagnet. Q: Electromagnets can be controlled by controlling what type of current? Choices: - magnetic - positive - negative - electric A:
electric
Answer the following question given this paragraph: Hydrogen bonds between water molecules explain some of water's properties. For example, hydrogen bonds explain why water molecules tend to stick together. Have you ever watched water drip from a leaky faucet or from a melting icicle? If you have, then you know that water always falls in drops rather than as separate molecules. The dew drops in Figure below are another example of water molecules sticking together. Q: What explains why water molecules tend to stick together? Choices: - helium bonds - covalent bonds - mineral bonds - hydrogen bonds A:
hydrogen bonds
Q: Answer the following question given this paragraph: Pea plants are naturally self-pollinating. In self-pollination , pollen grains from anthers on one plant are transferred to stigmas of flowers on the same plant. Mendel was interested in the offspring of two different parent plants, so he had to prevent self-pollination. He removed the anthers from the flowers of some of the plants in his experiments. Then he pollinated them by hand with pollen from other parent plants of his choice. When pollen from one plant fertilizes another plant of the same species, it is called cross-pollination . The offspring that result from such a cross are called hybrids. Q: What is it called when pollen from one plant fertilizes another plant of the same species? Choices: - cross-typing - cross-breeding - cross - vegetation - cross-pollination A:
A: cross-pollination
Question: Answer the following question given this paragraph: Q: What produces gametes with different alleles? Choices: - prokaryotes - anthocyanins - chromatids - heterozygotes A:
Answer: heterozygotes
*Question*
Answer the following question given this paragraph: Mutations that lead to cancer usually occur in genes that control the cell cycle. These include tumor-suppressor genes and proto-oncogenes. Q: Mutations that lead to cancer usually occur in genes that control the cell cycle. these include tumor-suppressor genes and what? Choices: - extinction - oncogenes - apparition - oncogenes - Darkness Oncogenes - proto-oncogenes A:
**Answer**
proto-oncogenes
Q: Answer the following question given this paragraph: The objects are at different temperatures, and heat flows from the hotter to the cooler object. This is always. Q: In which direction does heat always flow through objects? Choices: - from low to high - from cooler to hotter - from left to right - from hotter to cooler A:
A: from hotter to cooler