Explanation

A hypothesis is a tentative explanation for an observation or a scientific problem.

It is testable through experiments and forms the basis for further investigation.

Explanation

Heterocysts are specialized nitrogen-fixing cells found in some cyanobacteria (e.g., Anabaena).

They provide an anaerobic environment necessary for the enzyme nitrogenase to fix atmospheric nitrogen.

Explanation

Acetyl chloride (CH₃COCl) cannot be prepared directly from acetic acid due to the poor leaving ability of the –OH group.

It requires a chlorinating agent like PCl₅, PCl₃, or SOCl₂ for conversion.

Therefore, it cannot be prepared directly from acetic acid.

Explanation

The MN blood group system shows co-dominance, where both M and N alleles are equally expressed in the phenotype.

Individuals can have M, N, or MN blood types, with MN expressing both traits simultaneously.

Explanation

Uranium-235 (U²³⁵) is a fissile isotope, meaning it readily undergoes nuclear fission when struck by a neutron.

It is commonly used in nuclear reactors and atomic bombs for this reason.

Explanation

Explanation

1. The herpes virus capsid contains 162 capsomeres

. These capsomeres are arranged in an icosahedral shape, with 12 pentons (at the vertices) and 150 hexons (on the faces). 

Explanation

In angiosperms (flowering plants), the endosperm is a triploid (3n) tissue that provides nourishment to the developing embryo.

It is formed during double fertilization, where one sperm nucleus fuses with the egg cell to form the zygote, and another sperm nucleus fuses with two polar nuclei in the embryo sac to create the triploid endosperm.

This triploid nature is a key characteristic of angiosperms and distinguishes them from gymnosperms, where the endosperm is haploid. 

Explanation

SQUID stands for Superconducting Quantum Interference Device.

It is an extremely sensitive magnetometer used to detect very weak magnetic fields, such as those produced by brain activity (in magnetoencephalography, or MEG).

It can detect magnetic fields as small as 10⁻¹⁴ tesla, making it ideal for brain studies.

Explanation

 A proton is a fundamental particle found in the nucleus of an atom.

Its mass is relatively large compared to other particles like electrons, but smaller than some other subatomic particles.

Mesons are a type of particle made up of a quark and an antiquark.

Their mass range varies, but generally falls between that of a proton and an electron.

Some mesons, like the very heavy upsilon mesons, can have a mass significantly greater than a proton.