Q: Hundreds of organelles called myofibrils, made up of two types of protein filaments, are contained in each fiber of what? Read this paragraph and choose the correct option from the provided answers: 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. Choices: - bone - hair - cartilage - muscle A:
muscle

Q: In which solution is the amount of dissolved material equal both inside and outside of the cell? Read this paragraph and choose the correct option from the provided answers: An isotonic solution is a solution in which the amount of dissolved material is equal both inside and outside of the cell. Water still flows in both directions, but an equal amount enters and leaves the cell. Choices: - supersaturated - exothermic - hypotonic - isotonic A:
isotonic

Q: Q: What evolutionary concept emphasizes reproductive isolation? Read this paragraph and choose the correct option from the provided answers: 24.1 The biological species concept emphasizes reproductive isolation. Choices: - chemical species concept - toxic species concept - reproductive method concept - biological species concept A:
A: biological species concept

Question: Q: Name the two types of nucleic acids. Read this paragraph and choose the correct option from the provided answers: Living cells need organic molecules, known as nucleic acids . Nucleic acids are molecules that store genetic information. They pass that genetic information to the next generation. Deoxyribonucleic acid (DNA) is the nucleic acid that carries information for nearly all living cells today. DNA has done this for most of Earth's history. Ribonucleic acid (RNA) delivers genetic instructions to the location in a cell where protein is synthesized. RNA regulates protein synthesis. Some scientists think that RNA was the first replicating molecule. Choices: - isoleucin and leucine - dna ( trigraph acid ) and rna ( ribonucleic acid ) - lysine and methionine - dna (deoxyribonucleic acid) and rna (ribonucleic acid) A:
Answer: dna (deoxyribonucleic acid) and rna (ribonucleic acid)

*Question*
Q: Tree sap enclosing an organism in amber or an organism preserved in tar or ice are actually examples of what? Read this paragraph and choose the correct option from the provided answers: Fossils may form in other ways. With complete preservation, the organism doesn't change much. As pictured below ( Figure below ), tree sap may cover an organism and then turn into amber . The original organism is preserved so that scientists might be able to study its DNA. Organisms can also be completely preserved in tar or ice. Choices: - bones - corals - fuels - fossils A:
**Answer**
fossils

(Q).
Q: What is capable of altering the rate of time passing? Read this paragraph and choose the correct option from the provided answers: Strong gravitational fields can alter the rate of time passing. True. Choices: - strong planetary fields - weak gravitational fields - strong magnetic fields - strong gravitational fields A:
(A).
strong gravitational fields