Biology Test 285

• Blue Green algae, Green algae, and autotrophic plants are photosynthetic organisms. They carry out photosynthesis using sunlight, water, and carbon dioxide and produce carbohydrates and oxygen.
• Photosynthetic bacteria like purple bacteria or green sulfur bacteria carry out anoxygenic bacterial photosynthesis.
• However, they reduce hydrogen sulfide instead of water and elemental sulfur is evolved instead of oxygen.

Thus, the correct answer is 'Non-Evolution of O₂.'

ATP is synthesized by cells (in mitochondria and chloroplasts) is named phosphorylation.

The Calvin cycle can be described under three stages: carboxylation, reduction and regeneration. Pathway operated in cyclic manner.

Energy produced during light reaction is transferred to the dark reaction in form of ATP to fix the carbon dioxide in form of glucose.

In the photorespiratory pathway, there is no synthesis of ATP or NADPH. Therefore, photorespiration is a wasteful process.

In C₄ plants photorespiration does not occur. This is because they have a mechanism that increases the concentration of CO₂ at the enzyme site.

Microtubules are unbranched hollow tubules of indefinite length about 25 nm of thickness with 15 nm core and boundary formed of 13 helically arranged protofilaments of globular molecules of α and β tubulins. Microtubules grow from nucleating regions. Their tips can grow and shorten quickly. 
Microfilaments are double helical cylindrical rods or filaments of actin-like protein that occur in both muscular and nonmuscular eukaryotic cells.
As microtubules do not radiate out from ER as they radiate out from the centrioles during cell division.

So, the correct answer is option C.

Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. A skeletal muscle refers to multiple bundles (fascicles) of cells joined together called muscle fibers. The fibers and muscles are surrounded by connective tissue layers called fasciae.

Hinge joint occurs between humerus and radioulnar.

A hinge joint is a common class of synovial joint that includes the ankle, elbow and knee joints. Hinge joints are formed between two or more bones where the bones can only move along one axis to flex or extend. The elbow is a hinged joint made up of three bones which are the humerus, ulna and radius.

Myology is the branch of biological science in which different aspects of muscles are studied.

Myasthenia gravis is an autoimmune disorder which affects neuromuscular junctions.

It leads to various degrees of weakness in skeletal muscles.

The onset of myasthenia gravis can be sudden.