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What is Diatoms? Bacillariophyta are commonly known as diatoms because of their unique structure. These unicellular photosynthetic organisms are composed of two overlapping glass shells that fit together the way old pillboxes did, with one shell fitting inside the other. These microscopic diatoms have distinctive markings, or ornamentation on their shells. Their natural symmetry is visually astounding when viewed under the microscope.
There are two major groups of diatoms, divided on the basis of cell symmetry. The centric diatoms have radial symmetry, oriented around a mid-point much like a wheel and hub, as seen at the left.
Intracellular digestion, or cellular digestion, is the breaking in the interior of the cell of big molecules coming from outside or even from the own cell metabolism into smaller m
#question.why obelia is considered of special interest in zoology.
Biological mechanisms Annual rhythm. Innate behaviour pattern stimulated by environmental cues (shortened day length is the cue for preparation - candidates should exp
Shortness of Breath It is a subjective sensation of being unable too draw in enough air to breathe. Most often, this is associated with congestive cardiac failure and may
It is mostly spread by sexual contact, blood transfers and from HIV infected mother to child.
How are secondary cell walls different from primary cell walls? Primary cell walls are assembled on the surface of the plasma membrane whereas the cell is growing. They can gro
Information Processing in Sensory Neuron You have previously seen that the sensory neuron transmits the information it receives, as an action potential along its axon. We desc
Evidence Similarities between 79° and 70°, eg Feeding activity continuous / continues for 24 hours during polar day (summer months) feeding activity more intense i
Alternative polyadenylation sites Exact pre-mRNAs hold more than single group of signal sequences for 3' end polyadenylation and cleavage. In some cases, the area of t
Q. Whcih group of individual animals and plants called Species? A group of individual plants and animals that are fundamentally alike is treated as a ,species. Species is a par
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