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Lysosomes contain which type of enzymes?
Lysosomes are membrane-bound organelles containing acid hydrolases (hydrolytic enzymes) that digest macromolecules. Oxidative enzymes are in peroxisomes; meiotic/mitotic enzymes are involved in cell division.
A projectile is fired at $45ยฐ$ to the horizontal. The elevation angle of the projectile at its highest point, as seen from the point of projection, is:
At max height $H = \dfrac{u^2}{4g}$; horizontal distance $= \dfrac{R}{2} = \dfrac{u^2}{2g}$
Elevation angle: $\tan\phi = \dfrac{H}{R/2} = \dfrac{u^2/(4g)}{u^2/(2g)} = \dfrac{1}{2}$
$\phi = \mathbf{\tan^{-1}\!\left(\dfrac{1}{2}\right)}$
Neonatal Respiratory Distress Syndrome (RDS) / Hyaline Membrane Disease
Classic features in a preterm neonate (34 weeks):
- Grunting (auto-PEEP to prevent alveolar collapse)
- Subcostal/intercostal retractions
- Central cyanosis
- Ground glass appearance + air bronchograms on CXR
Pathophysiology:
\[\downarrow \text{Surfactant} \Rightarrow \uparrow \text{Alveolar surface tension} \Rightarrow \text{Alveolar collapse (atelectasis)} \Rightarrow \text{V/Q mismatch} \Rightarrow \text{Hypoxia}\]
Treatment:
- Surfactant replacement therapy (Poractant alfa / Beractant) via ETT โ single or multiple doses
- Respiratory support: nCPAP (preferred if breathing spontaneously) or mechanical ventilation
- Oxygen to maintain SpOโ \(91{-}95\%\) (avoid hyperoxia โ risk of ROP)
- Caffeine citrate (reduces apnea of prematurity)
Prevention (antenatal): Betamethasone \(12\,\text{mg}\) IM ร 2 doses (24 hr apart) given to mother before 34 weeks delivery โ accelerates fetal surfactant production.
Which statements about capital income and revenue income are correct?
- Revenue income includes amounts received from renting out part of business premises.
- Capital income includes amounts received from the sale of non-current assets.
- Capital income includes loans taken by a business.
Option B (1 and 2 only) is correct.
- Statement 1 (True): Rental income is regular and recurring โ revenue income.
- Statement 2 (True): Proceeds from selling a non-current asset are a one-off receipt โ capital income.
- Statement 3 (False): Loans are liabilities, not capital income.
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