All blood cells and platelets originate from stem cells

a. true
b. false


Ans: a. true

Biology & Microbiology

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Which of the following play a central role in animal camouflage?

a. pattern and simple colour b. pattern and behaviour c. simple colour and behaviour d. simple colour, pattern, and behaviour

Biology & Microbiology

Bacteria isolated from a hot tub at 39 °C are probably which of the following?

A. thermophiles B. psychrotrophs C. mesophiles D. hyperthermophiles

Biology & Microbiology

Which of the following statements is false?

A. The rapid depolarization phase of the action potential in pacemaker cells results from the influx of sodium through voltagegated sodium channels. B. The repolarization of the pacemaker cells following an action potential allows for the heart to relax between contractions. C. The resting membrane potential of cardiac pacemaker cells gradually becomes less negative on its own. D. Pacemaker cells repolarize by opening voltage-gated potassium channels. E. None of the answer options is false.

Biology & Microbiology

Which of the letters in the above figure represents

the anther where pollen is produced? a. A b. B c. C d. D e. none of these

Biology & Microbiology