Answer the following question given this paragraph: Each muscle fiber contains hundreds of organelles called myofibrils. Each myofibril is made up of two types of protein filaments: actin filaments, which are thinner, and myosin filaments, which are thicker. Actin filaments are anchored to structures called Z lines (see Figure below ). The region between two Z lines is called a sarcomere. Within a sarcomere, myosin filaments overlap the actin filaments. The myosin filaments have tiny structures called cross bridges that can attach to actin filaments. Q: Each muscle fiber contains hundreds of organelles called what? A:

OPTIONS:
- fast glycolytic fibres
- slow twitch fibres
- pores
- myofibrils

Answer: myofibrils

Problem: OPTIONS:
- purple red
- grayish red
- light pink
- bluish red
Q: Answer the following question given this paragraph: The structure of heme (Figure 19.29), the iron-containing complex in hemoglobin, is very similar to that in chlorophyll. In hemoglobin, the red heme complex is bonded to a large protein molecule (globin) by the attachment of the protein to the heme ligand. Oxygen molecules are transported by hemoglobin in the blood by being bound to the iron center. When the hemoglobin loses its oxygen, the color changes to a bluish red. Hemoglobin will only transport oxygen if the iron is Fe2+; oxidation of the iron to Fe3+ prevents oxygen transport. Q: When the hemoglobin loses its oxygen, it changes to what color? A:
Answer: bluish red

Problem:OPTIONS:
- collagen
- epithelium
- plasma
- periosteum

Answer the following question given this paragraph: Bones consist of four different types of tissue: periosteum, compact bone, spongy bone, and bone marrow. Ossification gradually changes the cartilage skeleton of the fetus to the bony skeleton of the adult. Q: Bones consist of four types of tissue, compact bone, spongy bone, bone marrow, and what? A:
****
A: periosteum

Answer the following question given this paragraph: The focal length , , of a lens or mirror is the distance from the surface of the lens or mirror to the place where the light is focused. This is called the focal point or focus . For diverging lenses or mirrors, the focal length is negative. Q: What type of lens and mirrors have a negative focal length? A:
OPTIONS:
- converging
- convexing
- subverging
- diverging
diverging

Answer the following question given this paragraph: Break down some substances in food that cannot be digested, such as fiber and some starches and sugars. Bacteria produce enzymes that digest carbohydrates in plant cell walls. Most of the nutritional value of plant material would be wasted without these bacteria. These help us digest plant foods like spinach. Q: What produces enzymes that digest carbohydrates in plant cell walls? A:
OPTIONS:
- pollen
- protists
- algae
- bacteria

Answer: bacteria

input with options: Answer the following question given this paragraph: Q: Species distributions are a consequence of both ecological and evolutionary what? A:
OPTIONS:
- fluctuations
- particles
- isolation
- interactions
output:
interactions