Q: Q: Proteins include 20 common types of what compounds? Read this paragraph and choose the correct option from the provided answers: There are 20 common amino acids in proteins. There are 64 possible codons, more than enough to code for the 20 amino acids. The genetic code is shown in Figure below . To see how scientists cracked the genetic code, go to this link: http://www. dnalc. org/view/16494-Animation-22-DNA-words-are-three-letters-long-. html . Choices: - mitochondria - rna acids - dna - amino acids A:
A: amino acids

Q: Q: The mature pollen grain is composed of two cells: the pollen tube cell and which other cell? Read this paragraph and choose the correct option from the provided answers: Figure 32.7 Pollen develops from the microspore mother cells. The mature pollen grain is composed of two cells: the pollen tube cell and the generative cell, which is inside the tube cell. The pollen grain has two coverings: an inner layer (intine) and an outer layer (exine). The inset scanning electron micrograph shows Arabidopsis lyrata pollen grains. (credit "pollen micrograph": modification of work by Robert R. Wise; scale-bar data from Matt Russell). Choices: - ova - glial cell - photosynthesis cell - generative cell A:
A: generative cell

Q: Q: What occurs when the cartilage at the ends of the bones breaks down? Read this paragraph and choose the correct option from the provided answers: Osteoarthritis occurs when the cartilage at the ends of the bones breaks down. The break down of the cartilage leads to pain and stiffness in the joint. Decreased movement of the joint because of the pain may lead to weakening of the muscles that normally move the joint, and the ligaments surrounding the joint may become loose. Osteoarthritis is the most common form of arthritis . It has many contributing factors, including aging, sport injuries, fractures, and obesity. Choices: - stress fracture - rheumatism - osteoporosis - osteoarthritis A:
A: osteoarthritis

Q: Q: Sexual signaling molecules released by fungi are known as what? Read this paragraph and choose the correct option from the provided answers: Choices: - sperm - hormones - vibrations - pheromones A:
A: pheromones