Sickle cell anemia is caused by a defect in the A oxygen-carrying pigment B. abi
ID: 174155 • Letter: S
Question
Sickle cell anemia is caused by a defect in the A oxygen-carrying pigment B. ability of the C. ability of red blood cells to D. chloride ion blood to clot. fight infection. transport protein. 8. A nucleic acid containing 32% thymine would contain how much cytosine: 18 B, 32% C. 36% 9. In plants and animals, the zygote develops by which of the following processes? B. meiosis C. syngamy D. synapsis E. reduction division 20. In the absence of oxygen, can cells utilize the electron transport chain? A. Yes, all cells can make use of the electron transport chain in the absence of oxygen via fermentation. B. No, oxygen is a required cofactor for the complexes in the electron transport chain. Yes, in the case that a cell electron transport can use a terminal electron acceptor other than oxygen. it can make use of the No, chain. ygen is the primary electron acceptor in electron transport chains in all cell types. 21. Enzymes function to A react with other enzymes B. catalyze chemical C transport molecules and ions D. regulate messages to form a product. reactions. across membranes. between cells. 22. The point of constriction on chromosomes that contains certain repeated DNA sequences that bind specific proteins is called: A. The kinetochore B. The centromere C. The cohesin complex D. The centriole E. The centrosome 23. Many metabolic pathways are ultimately concerned with ATP either with the generation of ATP or with the requirement of ATP for that pathway to function. Why is ATP so important to metabolism? A. Hydrolysis of ATP is used to drive reactions B. Hydrolysis of the bond between adenine and ribose in ATP is commonly used to release energy that can be used to drive other cellular reactions C. The phosphate groups of ATP are held together by unstable bonds that can be broken to release energy D. ATP is a protein that serves as the energy currency of cells 24. In glycolysis, a major portion of the energy remains in the final product, which is called: A. Glucose B. Citrate C. Glyceraldehyde 3-phosphate (G3P) D. PyruvateExplanation / Answer
17. Sickle cell anaemia – people suffering from sickle cell anemia have abnormal haemoglobin called hemoglobin S due to which the oxygen carrying capacity of haemoglobin is impaired.
Therefore the answer is option A.
18. The correct answer is option A .
The amount of Adenine = Thymine and Guanine = Cytosine.
As the cell has 32% thymine, the amount of adenine = 32%. The total amount of thymine and adenine = 64%.
Therefore the amount of Guanine and Cytosine together = 100 – 64 = 36% half of which is is cytosine = 18%.
19. The correct answer is option B.
Meiosis is the process by which zygote develops.
20. The correct answer is option B.
In aerobic respiration, oxygen is the final acceptor of electrons in the electron transport chain. In the absence of oxygen the electron transport chain would come to a halt.
21. answer is option B
Enzymes function to speed up (catalyze ) the chemical reactions in living organisms.
22. answer is option B
Each chromosome has a point of constriction called the centromere. Here, on the chromosomes a complex of proteins assemble which form the kinetochore which is attached to the microtubules.
23. Answer is option C.
ATP is called as the energy currency of the cell. It is used to drive all the chemical reactions of the cell. When ATP is broken down it forms ADP and Phosphate molecule. The energy given off is used to drive the chemical processes.
24. answer is option D.
The end product of glycolysis is pyruvate.
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