Biology Times 07.2019

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Biology Times (^19) July ...

Structure of a Neuron Neurons are the nerve cells. A typical neuron (Fig.1) consists of a cell body and two types of processes – ...

Biology Times (^19) July passes to the post-synaptic neuron or an effector cell. In most neurons, the plasma membrane of the den ...

ions responsible for carrying charge cannot penetrate the plasma membrane’s lipid bilayer. There is a small build up of anions i ...

Biology Times (^19) July depolarized. The membrane is said to be hyperpolarized, if the inner side of the membrane becomes more ...

neuron that occurs when it is stimulated is termed action potential, or nerve impulse (Fig.6). In a resting membrane, the voltag ...

Biology Times (^19) July revert (return) to the resting level (-70 mV). The direction of the electrical gradient for Na+ is reve ...

be initiated by a larger-than-normal stimulus. It coincides with the period during which the voltage-gated K+ are open after vol ...

Biology Times (^19) July In both a neuron and an electrical circuit, this voltage rises to the steady state level asymptotically ...

A B C (a) Vm PK PNa (b) PNa Vm PK (c) PK Vm PNa (d) Vm PNa PK Which of the following is not true about depolarizing phase of ac ...

Plant Kingdom Identify the structure and its respective function: (a) Corolloid root of cycas for defense mechanism (b) Coroll ...

Recognise the figure and find out the correct matching (a) a- antheridia, b- archegonia (b) a- archegoni ...

(a) A- Chlamydomanas, B- Dictyota, C- Polysiphonia, D- Laminaria (b) A- Selaginella, B- Dictyota, C- Polysiphonia, D- Porphyra ( ...

(c) Fixing atmospheric nitrogen (d) Repoduction Identify 1, 2,3, 4 and 5 in the given diagram (a) 1- Cell wall, 2- cell membr ...

(a) 1-Cocci, 2-Spirilla, 3-Bacilli, 4-Vibrio (b) 1-Bacilli, 2-Spirilla, 3-Vibrio, 4- Cocci (c) 1-Bacilli, 2-Vibrio, 3-Cocci, 3-S ...

(b) It is resistant to wall attacking antibiotics such as penicillin. (c) It is pleomorphic and varies in shape from spherica ...

tRNA has two unequal free arms .... (a) Short arm ending in -A and long arm in -ACC (b) Short arm ending in -G and long arm in ...

(a) The purpose of the blender is to detach viruses from the bacteria (b) Progeny generations of T bacteriophage contained but n ...