Model Paper 2 — NEET STD 11 Science — Question

Which part of body secretes the hormone secretin

Cancer can be caused by the use of

In a cell, the separation of DNA strands is brought about by the enzyme DNA helicase, whereas in PCR, the separation of DNA strands is due to :

Which statements are incorrect for mechanisms of nerve impulse conduction along electrical junctions of neuron or electrical synapse ?
(i) Nerve impulse flow directly from one neuron to other across the synapses in electrical synapses.
(ii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon.
(iii) Impulse transmission across an electrical synapse is always faster than that across a chemical synapse.
(iv) Electrical synapses are rare in our system.
(v) At an electrical synapse, the membranes of the pre and post-synaptic neurons are separated by a fluid-filled space called synaptic cleft is thick.
(vi) Chemicals called neurotransmitters are involved in the transmission of impulses at this synapse.

Smack is generally taken by

The sex chromosomes in females are

Testis produce

Which of the following abnormalities is due to autosomal dominant mutation?