STD 11 - 14. Breathing and exchange in gases — NEET STD 11 Science — Question

The ionic gradients across the resting membrane are maintained by the

Myofilaments or myofibrils are

Which of the following system provides the fastest means of communication within the body?

Assertion: The maximum volume of air a person can breathe in after a forced expiration is called vital capacity.
Reason: This includes ERV, TV and IRV

Assertion: Arthropoda are the largest phylum of animals which includes insects.
Reason: Over two-thirds of all named species on earth are arthropods.

Vasectomy has no effect on the sexual life of male because :

Which of the following is not the result of convergent evolution?

Which of the following is the contractile protein of a muscle

Given below are two statements:
Statement I: In prokaryotes, the positively charged DNA is held with some negatively charged proteins in a region called nucleoid.
Statement II: In eukaryotes, the negatively charged DNA is wrapped around the positively charged histone octamer to form nucleolus.
Choose the correct answer from the options given below:

From given characters about structure of contractile proteins actin which option contain wrong characters :
(i) Each actin filament is made of two 'F' (filamentous) actins helically wound to each other.
(ii) Many monomeric proteins called meromyosins constitute one thick filament.
(iii) Two filaments of protein, troponin run close to the 'F'actins throughout its length.
(iv) Each meromyosin has two important parts, a globular head with a short arm called the heavy meromyosin (HMM) and a tail, called the light meromyosin (LMM).
(v) In the resting state a subunit of tropomyosin masks the active binding sites for myosin on the actin filaments.
(vi) Each 'F' actin is a polymer of monomeric 'G' (Globular) actins.
(vii) The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for thin filament.