Answer the following question given this paragraph: Igneous rocks form from cooled magma or lava. Q: What type of rocks form from cooled magma or lava? Choices: - granite - sedementary - metamorphic - igneous A:
igneous
Answer the following question given this paragraph: Isotopes are named for their number of protons plus neutrons. If a carbon atom had 7 neutrons, what would it be named?. Q: Isotopes are named for their number of ______ plus neutrons? Choices: - electrons - atoms - nuclei - protons A:
protons
Q: Answer the following question given this paragraph: As the membrane depolarizes, another set of ion channels called voltage-gated sodium channels are triggered to open. Sodium ions enter the muscle fiber, and an action potential rapidly spreads (or "fires") along the entire membrane to initiate excitation-contraction coupling. Things happen very quickly in the world of excitable membranes (just think about how quickly you can snap your fingers as soon as you decide to do it). Immediately following depolarization of the membrane, it repolarizes, re-establishing the negative membrane potential. Meanwhile, the ACh in the synaptic cleft is degraded by the enzyme acetylcholinesterase (AChE) so that the ACh cannot rebind to a receptor and reopen its channel, which would cause unwanted extended muscle excitation and contraction. Propagation of an action potential along the sarcolemma is the excitation portion of excitation-contraction coupling. Recall that this excitation actually triggers the release of calcium ions (Ca++) from its storage in the cell's SR. For the action potential to reach the membrane of the SR, there are periodic invaginations in the sarcolemma, called T-tubules ("T" stands for "transverse"). You will recall that the diameter of a muscle fiber can be up to 100 m, so these T-tubules ensure that the membrane can get close to the SR in the sarcoplasm. The arrangement of a T-tubule with the membranes of SR on either side is called a triad (Figure 10.7). The triad surrounds the cylindrical structure called a myofibril, which contains actin and myosin. Q: What is the arrangement of a t-tubule with the membranes of sr on either side called? Choices: - aracnid - orchid - acid - triad A:
A: triad
Question: Answer the following question given this paragraph: 15.2 Sponges and Cnidarians Animals included in phylum Porifera are parazoans and do not possess true tissues. These organisms show a simple organization. Sponges have multiple cell types that are geared toward executing various metabolic functions. Cnidarians have outer and inner tissue layers sandwiching a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion. The cnidocyte is a specialized cell for delivering toxins to prey and predators. Cnidarians have separate sexes. They have a life cycle that involves morphologically distinct formsmedusoid and polypoidat various stages in their life cycle. Q: Porifera are parazoans that exhibit simple organization and lack true what? Choices: - molecules - nuclei - cell membranes - tissues A:
Answer: tissues
*Question*
Answer the following question given this paragraph: Dirt that gets on our hands can be difficult to remove by rinsing with cold water. What are some things that you can do to increase the solubility of dirt, making it easier to dissolve in running water?. Q: Increasing what property of dirt would make it easier to rinse off your hands? Choices: - turbidity - density - viscosity - solubility A:
**Answer**
solubility
*Question*
Answer the following question given this paragraph: Prokaryotic cells are extremely small and have a variety of shapes. Most have flagella and a cell wall. They have several other cell structures as well. Their DNA exists as large and small loops. Some prokaryotes form biofilms, which are colonies of cells stuck to a surface. Q: What are colonies of cells stuck to a surface called? Choices: - membranes - cellular coating - membranes - biofilms A:
**Answer**
biofilms