Answer the following question given this paragraph: Microfilaments Of the three types of protein fibers in the cytoskeleton, microfilaments are the narrowest. They function in cellular movement, have a diameter of about 7 nm, and are made of two intertwined strands of a globular protein called actin (Figure 4.23). For this reason, microfilaments are also known as actin filaments. Q: What type of protein fibers in the cytoskeleton are the narrowest? Choices: - macrophages - mitosis - capillaries - microfilaments A:
microfilaments
Answer the following question given this paragraph: Compounds that form from two or more nonmetallic elements, such as carbon and hydrogen, are called covalent compounds . In a covalent compound, atoms of the different elements are held together in molecules by covalent bonds. These are chemical bonds in which atoms share valence electrons. The force of attraction between the shared electrons and the positive nuclei of both atoms holds the atoms together in the molecule. A molecule is the smallest particle of a covalent compound that still has the properties of the compound. Q: Compounds that form from two or more nonmetallic elements are called what? Choices: - ionic bonds - valent bonds - hydrogen bonds - covalent bonds A:
covalent bonds
Q: Answer the following question given this paragraph: Plants can respond to the change of season by losing their leaves, flowering, or breaking dormancy. Q: Plants can lose their leaves, flower, or break dormancy in response to a change in what? Choices: - events - periods - averages - seasons A:
A: seasons
Question: Answer the following question given this paragraph: Fog ( Figure below ) is a cloud on the ground. Fog forms when humid air near the ground cools below its dew point. Each type of fog forms in a different way. Q: What is formed when humid air near the ground cools below its dew point? Choices: - steam - weather - smoke - fog A:
Answer: fog
*Question*
Answer the following question given this paragraph: At birth, a female's ovaries contain all the eggs she will ever produce. However, the eggs do not start to mature until she enters puberty. After menarche, one egg typically matures each month until a woman reaches middle adulthood. Q: When do the eggs in a female's ovaries start to mature? Choices: - maturity - adolescence - adulthood - puberty A:
**Answer**
puberty
*Question*
Answer the following question given this paragraph: Figure 35.2 Nervous systems vary in structure and complexity. In (a) cnidarians, nerve cells form a decentralized nerve net. In (b) echinoderms, nerve cells are bundled into fibers called nerves. In animals exhibiting bilateral symmetry such as (c) planarians, neurons cluster into an anterior brain that processes information. In addition to a brain, (d) arthropods have clusters of nerve cell bodies, called peripheral ganglia, located along the ventral nerve cord. Mollusks such as squid and (e) octopi, which must hunt to survive, have complex brains containing millions of neurons. In (f) vertebrates, the brain and spinal cord comprise the central nervous system, while neurons extending into the rest of the body comprise the peripheral nervous system. (credit e: modification of work by Michael Vecchione, Clyde F. Roper, and Michael J. Sweeney, NOAA; credit f: modification of work by NIH). Q: Mollusks such as squid and octopi, which must hunt to survive, possess what complex organs containing millions of neurons? Choices: - gills - hearts - tentacles - brains A:
**Answer**
brains