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: An ammeter must be connected in series with what to allow it to accurately measure the current flow without causing any disruptions? Read this paragraph and choose the correct option from the provided answers: An ammeter measures the current traveling through the circuit. They are designed to be connected to the circuit in series, and have an extremely low resistance. If an ammeter were connected in parallel, all of the current would go through the ammeter and very little through any other resistor. As such, it is necessary for the ammeter to be connected in series with the resistors. This allows the ammeter to accurately measure the current flow without causing any disruptions. In the circuit sketched above, the ammeter is . Choices: - insulators - configurations - capacitors - resistors A:
resistors

Q: Where does the nucleus store chromatin ? Read this paragraph and choose the correct option from the provided answers: Figure 4.11 The nucleus stores chromatin (DNA plus proteins) in a gel-like substance called the nucleoplasm. The nucleolus is a condensed region of chromatin where ribosome synthesis occurs. The boundary of the nucleus is called the nuclear envelope. It consists of two phospholipid bilayers: an outer membrane and an inner membrane. The nuclear membrane is continuous with the endoplasmic reticulum. Nuclear pores allow substances to enter and exit the nucleus. Choices: - chloroplasts - ribosome - xerophyte - nucleoplasm A:
nucleoplasm