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Which type of cell came first in evolution - the eukaryotic cell or the prokaryotic cell?
This is an interesting problem of biological evolution. The most accepted hypothesis asserts that the simpler cell, the prokaryotic cell, appeared earlier in evolution than the more difficult eukaryotic cell. The endosymbiotic hypothesis, for instance, affirms that aerobic eukaryotic cells appeared from the mutualist ecological interaction among aerobic prokaryotes and primitive anaerobic eukaryotes.
Define Precautions for Determination of Haemoglobin Content in Blood 1. Potassium cyanide is highly toxic and hence drabkin's solution should not be pippeted by mouth. 2. Dr
what are the physiological adaptation shown my prey as defence
Merits of Micro Propagation The special merits of micro propagation are: 1. It considerably increases the rate of multiplication 2. High rate of multiplication can be ma
Is heart patient can do exercise Advise the patient to consult the doctor before starting any exercise. Doctor will advise the patient to choose exercises as per his condition;
Temperature Stress We know that temperature alongwith water is an important influence on the geographical distribution and range of organisms. Every organism is restricted to a
Indications for Surgery : Patients usually present with fatigue, dyspnoea and ventricular arrhythmias. If they have additional tricuspid regurgitation, pulmonary valve replacement
Q. Explain causes of Shigellosis? Shigellosis is caused by the genus Shigella and is a common enteric (intestinal) infection. The genus has four serological groups,
Q. Which are the phases of the menstrual cycle? The menstrual cycle is divided into two major phases: the luteal (or secretory) phase and the follicular (or menstrual) phase.
Q. What is the significance of water for enzymatic activity? Enzymes, Biological catalysts, depend on water to reach their substrates and bind to them. There is no enzymatic ac
Which of the following serves as an actuating signal, or as part of an actuating signal, in a system with feedback? (Either positive feedback or negative feedback) A. Blood pla
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