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Questions in biology

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

[Answered] Tick (✔) the correct option. 1. These days, ______ threaten our environment. (a) Gas emissions (b) Smoke (c) Both a. and b. 2. This causes ______ in the environment, which harms our surroundings. (a) pollution (b) water logging (c) storms 3. These cause ______ effect in the environment, which harms our surroundings. (a) Bluehouse (b) Greenhouse (c) Yellowhouse 4. This effect causes the earth to warm up, which is known as ______. (a) World heating (b) Global warming (c) None of these 5. Pollution also leads to ______ in the rain. This damages aquatic life, plants and crops. (a) Bases (b) Acid (c) None of these 6. It also causes damage to the ______ layer of the atmosphere. (a) Troposphere (b) Stratosphere (c) Ozone 7. This layer protects us from the harmful ______ rays of the Sun. (a) Ultra-violet (b) Chemical (c) Both of these 8. Chemicals such as ______ destroy this protective layer by making holes in it. (a) Hfs (b) CFCs (c) BVs 9. The biggest such hole is over ______. (a) Australia (b) Antarctica (c) Africa 10. The scientists who study how plants and animals depend on their surroundings and what effect the surroundings have on them are called ______. (a) Researchers (b) Ecologists (c) None of these

[Answered] Among the products of glycolysis, which compounds contain energy that can be used by other biological reactions? A. pyruvate and ATP only B. ATP only C. NADH only D. ATP and NADH only E. pyruvate, ATP, and NADH

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

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

[Answered] 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

[Answered] 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)?

[Answered] 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

[Answered] 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.

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