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Questions in biology

[Free] Which best describes the relationship between evolution and natural selection? A. Natural selection leads to evolution. B. Evolution leads to natural selection. C. Natural selection is the same as evolution. D. Evolution and natural selection are not related.

[Free] Succession occurs when environmental factors affect an ecosystem change. Please select the best answer from the choices provided. A. True B. False

[Free] Arrange these action potential events in their proper sequence. 1. The cell becomes hyperpolarized 2. Cell receives signals at the dendrites 3. [tex]$K^{-}$[/tex] gates close 4. [tex]$Na ^{+}$[/tex] gates close, and [tex]$K^{+}$[/tex] gates open 5. [tex]$Na ^{+}$[/tex] gates open 6. Threshold of excitation A. 5, 2, 6, 4, 3, 1 B. 2, 5, 4, 6, 3, 1 C. 2, 6, 5, 4, 3, 1 D. 2, 5, 6, 4, 3, 1

[Free] Complete the concept map using the word bank. WORD BANK | absorbs nutrients | anus | ascending | bile | cardiac sphincter | | :---------------- | :---------------- | :---------------- | :---------------- | :---------------- | | cecum | chyme | colon | duodenum | esophagus | | fundus | jejunum | large intestines | liver | mouth | | pancreas | peristalsis | producing amylase | small intestine | stomach | | rectum | rugae | teeth | tongue | waste | BREAKDOWN FOOD functions to DIGESTIVE SYSTEM DIGESTIVE SYSTEM composed of ACCESSORY ORGANS and ALIMENTARY CANAL ACCESSORY ORGANS such as ... to BREAKDOWN FATS ALIMENTARY CANAL begins with ... goes to ... has SALIVARY GLANDS for CHEWING, for MANIPULATING FOOD ALIMENTARY CANAL goes to ... food moves by ... opens from ... ... goes to GALL BLADDER GALL BLADDER production stores ... food becomes ... ... goes to ... which is TOP OF THE STOMACH ... goes to BODY with folds ... ... opens to PYLORIC SPHINCTER PYLORIC SPHINCTER opens to ... is POUCH LIKE ... is FIRST SECTION ... is SECOND SECTION ... is ILLIUM as MESENTERY ... is THIRD SECTION function is to ... ... is THIRD SECTION hangs like CURTAIN which GREATER OMENTUM ... goes to ... consist of TRANSVERSE, DESCENDING ... stores ... ... function to ... has ... OPENING

[Free] 4. What is meant by a 'habitat'? Why do animals need habitats? 5. Insect colonies are the best examples of 'social life' among animals. How? How should we treat animals?

[Free] In order to yield haploid cells, what separates in meiosis II? a) Parent and daughter DNA b) Homologous chromosomes c) Male and female chromosomes d) Sister chromatids

[Free] Which of the following has voltage-gated ion channels that allow for conduction of electrical signals? It also has T-tubules that extend deep into the cell. a. sarcoplasm b. sarcolemma c. tropomyosin d. myosin e. myofibrils

[Free] (a) Water (i) Source of energy (b) Carbohydrate (ii) Essential for bones (c) Vitamin K (iii) Body growth (d) Calcium (iv) Keeps the body cool (e) Protein (v) Clotting of blood

[Free] 6. What is the difference between aerobic and anaerobic respirations? A. Aerobic respiration ends with different products while the same product results in anaerobic respiration. B. Proteins are the main respiratory substrate for both aerobic and anaerobic respiration. C. Glycolysis is the first pathway for aerobic while Kreb's cycle is for anaerobic respiration. D. Aerobic respiration produces much more energy than anaerobic respiration. 7. Which one of the following statements disproves spontaneous generation theory based on a step wise experimental work? A. Life is an inherent property of the universe and everlasting. B. Different life forms on the Earth were created by a supreme being within six days. C. Life has reached to the Earth in the form of spores with falling meteorite. D. Both macro and micro-organisms could arise from pre-existing organisms.

[Free] 6. Answer the following. (a) What are domestic animals? (b) What are pets? (c) How do pets get food and shelter? (d) How do domestic animals help us? (e) Where do we get leather from?