Q: Q: What temperature scale is obtained by adding 273 degrees from the corresponding celsius temperature? Read this paragraph and choose the correct option from the provided answers: The Celsius scale is the standard SI temperature scale. It is equal to the Kelvin scale if you minus 273 from the Celsius reading. Water has a boiling point of and a freezing point of . Choices: - whittle scale - seismic scale - ph scale - kelvin scale A:
A: kelvin scale

Q: Q: Where do polychaete worms live? Read this paragraph and choose the correct option from the provided answers: Polychaete worms live on the ocean floor. They may be sedentary filter feeders or active predators or scavengers. Active species crawl along the ocean floor in search of food. Choices: - lakes - digestive tract - garden soil - the ocean floor A:
A: the ocean floor

Q: Q: Upon ovulation, the oocyte released by the ovary is swept into where? Read this paragraph and choose the correct option from the provided answers: Contact Between Sperm and Oocyte Upon ovulation, the oocyte released by the ovary is swept intoand alongthe uterine tube. Fertilization must occur in the distal uterine tube because an unfertilized oocyte cannot survive the 72-hour journey to the uterus. As you will recall from your study of the oogenesis, this oocyte (specifically a secondary oocyte) is surrounded by two protective layers. The corona radiata is an outer layer of follicular (granulosa) cells that form around a developing oocyte in the ovary and remain with it upon ovulation. The underlying zona pellucida (pellucid = "transparent") is a transparent, but thick, glycoprotein membrane that surrounds the cell's plasma membrane. As it is swept along the distal uterine tube, the oocyte encounters the surviving capacitated sperm, which stream toward it in response to chemical attractants released by the cells of the corona radiata. To reach the oocyte itself, the sperm must penetrate the two protective layers. The sperm first burrow through the cells of the corona radiata. Then, upon contact with the zona pellucida, the sperm bind to receptors in the zona pellucida. This initiates a process called the acrosomal reaction in which the enzyme-filled "cap" of the sperm, called the acrosome, releases its stored digestive enzymes. These enzymes clear a path through the zona pellucida that allows sperm to reach the oocyte. Finally, a single sperm makes contact with sperm-binding receptors on the oocyte's plasma membrane (Figure 28.2). The plasma membrane of that sperm then fuses with the oocyte's plasma membrane, and the head and mid-piece of the "winning" sperm enter the oocyte interior. How do sperm penetrate the corona radiata? Some sperm undergo a spontaneous acrosomal reaction, which is an acrosomal reaction not triggered by contact with the zona pellucida. The digestive enzymes released by this reaction digest the extracellular matrix of the corona radiata. As you can see, the first sperm to reach the oocyte is never the one to fertilize it. Rather,... Choices: - placental barrier - vas deferens - umbilical cord - uterine tube A:
A: uterine tube

Q: Q: All gymnosperm species and many eudicot species undergo what? Read this paragraph and choose the correct option from the provided answers: Choices: - exploitation - mutations - third growth - secondary growth A:
A: secondary growth