Answer the following question given this paragraph: The sliding-and-shortening process occurs all along many myofibrils and in many muscle fibers. It causes the muscle fibers to shorten and the muscle to contract. Q: What part of the muscle fibers cause shortening and contraction? Choices: - fasciae - pores - collagen - myofibrils A:
myofibrils
Answer the following question given this paragraph: 2. The second step in eukaryotic cell division is division of the cell's nucleus. This includes division of the chromosomes. This step is called mitosis. It is a complex process that occurs in four phases. The phases of mitosis are described below. Q: The second step in eukaryotic cell division is division of which part of the cell? Choices: - protons - molecules - Cell Division - nucleus A:
nucleus
Q: Answer the following question given this paragraph: Lymphatic vessels make up a body-wide circulatory system. The fluid they circulate is lymph. Lymph is a fluid that leaks out of capillaries into spaces between cells. As the lymph accumulates between cells, it diffuses into tiny lymphatic vessels. The lymph then moves through the lymphatic system from smaller to larger vessels. It finally drains back into the bloodstream in the chest. As lymph passes through the lymphatic vessels, pathogens are filtered out at small structures called lymph nodes (see Figure above ). The filtered pathogens are destroyed by lymphocytes. Q: What destroys the filtered pathogens? Choices: - parasites - neutrophils - antibodies - lymphocytes A:
A: lymphocytes
Question: Answer the following question given this paragraph: Q: After what stage do the last 2 stages of food processing occur? Choices: - filtration - excretion - circulation - digestion A:
Answer: digestion
*Question*
Answer the following question given this paragraph: Mutation creates new genetic variation in a gene pool. It is how all new alleles first arise. In sexually reproducing species, the mutations that matter for evolution are those that occur in gametes. Only these mutations can be passed to offspring. For any given gene, the chance of a mutation occurring in a given gamete is very low. Thus, mutations alone do not have much effect on allele frequencies. However, mutations provide the genetic variation needed for other forces of evolution to act. Q: What phenomenon, crucial for evolution, creates new genetic variation in a gene pool and is how all new alleles first arise? Choices: - radiation - natural selection - adaptation - mutation A:
**Answer**
mutation
(Q).
Answer the following question given this paragraph: As with melting, the energy in boiling goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. So boiling is also an isothermal process. Only when all of a substance has boiled does any additional energy go to changing its temperature. What happens when a liquid becomes a gas? We have already established that a liquid is composed of particles in contact with each other. When a liquid becomes a gas, the particles separate from each other, with each particle going its own way in space. This is how gases tend to fill their containers. Indeed, in the gas phase most of the volume is empty space; only about 1/1,000th of the volume is actually taken up by matter (Figure 10.4 "Liquids and Gases"). It is this property of gases that explains why they can be compressed, a fact that is considered in Chapter 6 "Gases". Figure 10.4 Liquids and Gases. Q: What kind of process is boiling? Choices: - chemical - spheroidal - cavitation - isothermal A:
(A).
isothermal