What structural feature do cilia and flagella have in common? Despite their different names, flagella and cilia have the same axoneme structure, including nine doublet microtubules arranged in a circle around two central singlet microtubules (see Figure 19-28). Do cells have a support structure within the cytoplasm called the cytoskeleton? Cells have a support structure […]

Are sound and light waves longitudinal waves? Explanation: Sound is a longitudinal wave, while light is a transverse wave. Polarization requires the direction of the wave to be perpendicular to the direction of propogation; only light can do this. Doppler effect, refraction, and interference occur in both wave types. Are light waves longitudinal or transverse? […]

How is sunlight used by humans? The energy in them came from the sun. We use that energy to cook our food, warm our houses, run our cars, and make electricity. Solar energy is light energy. Some people hang clothes outside to dry in the sun. How is sunlight important in your life? It radiates […]

Why are producers in an ecosystem? Plants are producers. They make their own food, which creates energy for them to grow, reproduce and survive. Being able to make their own food makes them unique; they are the only living things on Earth that can make their own source of food energy. Of course, they require […]

How do arthropods protect themselves? Some arthropods have pincers and stings which they use to defend themselves against attackers. Scorpions also use their large pincers to catch animals. They then use their venom – filled sting to paralyze their prey. What protects an arthropod from drying out? What are the advantages of having an exoskeleton? […]

What carries impulses to the central nervous system? The central nervous system consists of the brain and spinal cord. Cranial nerves, spinal nerves, and ganglia make up the peripheral nervous system. The afferent division of the peripheral nervous system carries impulses to the CNS; the efferent division carries impulses away from the CNS. Which type […]

Which vertebrates are endothermic birds reptiles amphibians mammals bony fish? The correct answer – birds, mammals and bony fish. Birds, mammals and some fish such as bony fish are the groups of endothermic animals. Endothermic animals are warm-blooded animals. Animals of these groups always maintain constant body temperature, irrespective of change in the environment. Are […]

How are the 20 amino acids different from each other? The side groups are what make each amino acid different from the others. Of the 20 side groups used to make proteins, there are two main groups: polar and non-polar. The polar and nonpolar chemical traits allow amino acids to point towards water (hydrophilic) or […]

How much of the fluid filtered from the blood in the glomerulus is reabsorbed? About 99% of the water-like filtrate , small molecules, and lipid-soluble substances , are reabsorbed downstream in the nephron tubule. This means that the amount of urine eliminated is only about one percent of the amount of fluid filtrated through the […]

Which step will a scientist likely perform first? Science is limited to the study of only living things. During a scientific investigation, which step will a scientist likely perform first? Define the problem for investigation. The scientific method must be followed in the step by step order it is written, for every experiment and investigation […]