Most sources state that there are over 640 named skeletal muscles in the human body, although some figures go up to as many as 840. The dissension comes from those that count the muscles within a complex muscle.
Nucleotide arrangement in DNA can be seen by X-ray Crystallography. X-ray crystallography is used to determine 3D structures of macromolecules like proteins, nucleotides, etc. The basic principle of this techniques is that the wavelength of x-rays depends on the distance between the atoms of the structures which makes it useful for determining their arrangement.
Active Transport is defined as a process that involves the movement of molecules from a region of lower concentration to a region of higher concentration against a gradient or an obstacle with the use of external energy.”During the process of active transport, a protein pump makes use of stored energy in the form of ATP, to move molecules .The process of active is which uses an external energy ATP... more for the movement of the molecules..... # Some of the best examples of active transport include:- 1.Phagocytosis of bacteria by Macrophages... 2. Movement of Ca2+ ions out of cardiac muscle cells. 3. Transportation of amino acids across the intestinal lining in the human gut... 4. Secretion of proteins like enzymes, peptide hormones, and antibodies from different cells... 5. Functioning of the White Blood Cells by protecting our body by attacking diseases causing microbes and other foreign invaders...
The new plant varieties are produced by selection and hybridization. Selection is a non-random process which leads to individuals of different genotypes being represented unequally in their progeny in later generations of a population of self propagating units. Selection can be natural or artificial.As a part of agriculture, man started rearing plants and animals to meet his requirements. This is ... morewhen humans started to learn how to influence the process of natural evolution, so as to breed plant or animals. Slowly and gradually, this process of expedited evolution, through selection and cultivation of plants, acquired the form of a routine endeavor called as plant breeding. In this, heredity, which refers to the passage of various characteristic features from the main plant (the parent) to the plantlets (the progeny), plays an important role. The effects of heredity had been apparent to early man and he had taken advantage of them ever since the advent of agriculture. Various methods have evolved in plant breeding. One of the most important methods is that of selection. After the selection of parents with desired characteristics, they can be hybridized to yield better offsprings with both the parent characteristics. So, the correct answer is 'selection and hybridization'
The plant body of Riccia is gametophytic and gametophytes are fleshy, prostrate and dichotomously branched. Repeated dichotomy results into a typically rosette like appearance ..Riccia thallus grow in large number in close association, covering the surface like a mat. They are relatively poorly adapted to life on land. So they are mainly confined to damp and shady places. The species of Riccia are... more terrestrial, nonvascular plants commonly called amphibians of plant hence, option A is correct answer..
A potometer can be used to measure the rate of transpiration that's proportional to water uptake. Transpiration cannot be measured directly as some of the water will be used in photosynthesis..A potometer or transpirometer is a tool used to measure the rate of water loss from the leaves of the plant. Potometer measures the rate of transpiration on the basis of the equal amount of water absorbed a... morend transpired.hence option A is correct..
The sino atrial node (SA) node, present in upper posterior wall of right atrium, serves as pacemaker as it's rate of impulse generation is hightest (0.85/second) and determines the rate and rhythm of heartbeat. Atrio Ventricular Node (AVN) is a nodal tissue that regulates the heart beat and is present in base of right atrium adjacent to interatrial septum. It produces impulse at rate of 0.45/secon... mored which is lower than that of SA node and hence, it is not considered as pacemaker.
C is the answer
.The heart's ventricles, the two bottom chambers, contain muscles known as papillary muscles. These muscles attach to the leaflets of the tricuspid valve and bicuspid (mitral) valve via string-like tendons called the chordae tendineae