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Questions in biology

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] What structures in smooth muscle fibers act like the Z-discs of skeletal and cardiac muscle fibers?

[Terjawab] 1.1 Which ONE of the following is a reproductive isolating mechanism? A. Breeding at the same time of the year B. Same courtship behaviour C. Fertile offspring D. Adaptation to different pollinators 1.2 Which ONE of the following is a source of variation? A. Mitosis B. Cloning C. DNA replication D. Crossing over 1.3 Scientists can develop crops that are pest resistant through the process of ... A. Reproductive isolation B. Artificial selection C. Speciation D. Natural selection

[Terjawab] e. Define arthropods with any four examples. f. Write any three salient features of the animals belonging to Phylum Mollusca. g. Why is octopus kept in Phylum Mollusca? h. Define echinoderms with any two examples. i. Why is earthworm kept in Phylum Annelida? How does it differ from Ascaris (Roundworm)?

[Terjawab] Which part of the nervous system is responsible for the 'fight or flight' response? A. Parasympathetic nervous system B. Peripheral nervous system C. Central nervous system D. Sympathetic nervous system

[Terjawab] Which of the following best describes a characteristic of nervous tissue? A. Some of its cells send electrochemical messages. B. Its intercellular space is filled with collagen. C. It provides cushioning and protection from shearing forces. D. It contracts to perform movements.

[Terjawab] Which type of macromolecule is made up of subunits that are called amino acids? A. carbohydrate B. lipid C. nucleic acid D. protein

[Terjawab] Muscles will fatigue very quickly during aerobic exercises, such as jogging, due to lactic acid buildup.

[Terjawab] Which characteristic of living organisms involves ingestion, absorption, and excretion? A. Growth B. Nutrition C. Respiration

[Terjawab] Place the following events of muscle contraction in the correct order: 1. Calcium is released in the muscle fiber 2. Muscle fibers contract 3. Electrical signal travels down the motor neuron 4. Electrical signal enters the muscle fiber