Common features of striated and faintly striated cardiac muscles are

$\left(\mathrm{a}\right)$ Presence of troponin.
$\left(\mathrm{b}\right)$ Use of ${\mathrm{C}\mathrm{a}}^{2+}$ for muscle contraction.
$\left(\mathrm{c}\right)$ Vascularity
$\left(\mathrm{d}\right)$ Gap junctions.
$\left(\mathrm{e}\right)$ Control by Visceral Nervous System (ANS).

Which of these features are correct?

Which of the following statements are correct regarding the skeletal muscle?

A. Muscle bundles are held together by collagenous tissue layer called fascicle.

B. Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions.

C. Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins.

D. M line is considered as functional unit of contraction called sarcomere.

Choose the most appropriate answer from the options given below:

Statement I : Tendons attach one bone with another bone.
Statement II : Epiglottis is formed by elastic cartilage.

The correct option among the following is

The graph below depicts the velocity of an enzyme-catalyzed reaction vs. substrate concentration. Identify the alphabets with the correct descriptions.

I. $\mathrm{A}=$ Enzyme activity

II. $\mathrm{B}=$ Substrate concentration at maximum velocity

III. $\mathrm{A}=$ Substrate concentration at which half of the maximum velocity

IV. $\mathrm{B}=$ Half of the maximum velocity