Category: Science

explicar cmo la vida genera orden (baja entropa) en un universo que, por ley fsica, tiende al desorden (caos).

The short answer is: Newtons Third Law of Motion.

Many people intuitively think a rocket works like a person swimmingpushing against the water to move forward. However, in space, there is no medium (like air or water) to push against. Instead, a rocket relies on the conservation of momentum.

• Action and Reaction: Inside the rockets combustion chamber, fuel and oxidizer burn to create high-pressure gas. The engine nozzles accelerate this gas backward at incredible speeds.
• The “Push”: According to Newtons Third Law, for every action, there is an equal and opposite reaction. The force required to throw that exhaust mass out the back creates an equal force (thrust) pushing the rocket forward.
• The Momentum Balance: Think of it like standing on a skateboard with a heavy medicine ball. If you throw the ball away from you as hard as you can, you will roll in the opposite direction. You didn’t need to push against a wall; you just needed to throw mass away from yourself.

PSY 2012 PSICOLOGIA GENERAL (NOCHE) PARTE C GENERAL PSYCHOLOGY 3.0
Assignment Name	TAREAS 1
Closing Time	3/18/2026 11:00 PM (Current Time: 3/21/2026 12:51 PM America/New_York)
	Tarea 1: Ttulo: Explorando los factores de comportamiento Tarea: Elija un comportamiento especfico de inters (por ejemplo, procrastinacin, altruismo, toma de decisiones) e identifique factores cognitivos, afectivos y de personalidad relevantes que puedan influir en este comportamiento. Pasos: Investigue y seleccione un comportamiento en el que centrarse. Identifique y describa al menos dos factores cognitivos, afectivos y de personalidad que podran afectar este comportamiento. Discuta las posibles interacciones entre estos factores y su influencia combinada en el comportamiento elegido. Propsito: Esta tarea tiene como objetivo reforzar la comprensin de conceptos fundamentales relacionados con el comportamiento y los factores que influyen en l. Tarea 1: Explorar los factores de comportamiento Longitud: 800-1000 palabras estilo APA La tarea debe ser concisa y cubrir todos los puntos requeridos: seleccin de comportamiento, identificacin de factores cognitivos, afectivos y de personalidad, explicacin de las interacciones y citas adecuadas.

1. Explain the difference between prokaryotic and eukaryotic cells.

Answer: Prokaryotic cells lack a nucleus and membrane-bound organelles (e.g., bacteria), while eukaryotic cells have a nucleus and organelles (e.g., plant and animal cells).

2. Describe the structure and function of the mitochondrion.

Answer: Mitochondria have a double membrane; the inner membrane has folds called cristae. They produce ATP through cellular respiration.

3. What are the main stages of cellular respiration, and where do they occur?

Answer: Glycolysis (cytoplasm), Krebs cycle (mitochondrial matrix), and Electron Transport Chain (inner mitochondrial membrane).

4. How does photosynthesis convert light energy into chemical energy?

Answer: Chlorophyll captures light energy to produce ATP and NADPH in the light reactions; the Calvin cycle uses them to make glucose from CO.

5. Compare mitosis and meiosis.

Answer: Mitosis produces 2 identical diploid cells for growth/repair; meiosis produces 4 non-identical haploid gametes for sexual reproduction.

6. What are the central dogma steps of molecular biology?

Answer: DNA RNA Protein; DNA is transcribed into RNA, which is translated into protein.

7. Explain the role of enzymes and how temperature or pH affects them.

Answer: Enzymes lower activation energy for reactions. Extreme temperature or pH can denature enzymes, reducing activity.

8. Difference between DNA replication and transcription?

Answer: DNA replication copies DNA for cell division; transcription makes RNA from a DNA template for protein synthesis.

9. How do competitive and non-competitive inhibitors affect enzyme activity?

Answer: Competitive inhibitors bind the active site; non-competitive inhibitors bind elsewhere, changing enzyme shape.

10. Describe the plasma membrane structure and function.

Answer: Phospholipid bilayer with embedded proteins; controls transport of substances in/out of the cell.

11. Explain signal transduction.

Answer: Cells receive signals (ligands), activate receptors, and trigger intracellular pathways to respond.

12. How do ligand-gated ion channels work in neurons?

Answer: Binding of a neurotransmitter opens the channel, allowing ions to flow and generate an electrical signal.

13. Compare oxidative phosphorylation and substrate-level phosphorylation.

Answer: Oxidative phosphorylation uses the electron transport chain and chemiosmosis; substrate-level phosphorylation directly transfers a phosphate group to ADP.

14. Differences between protein structures.

Answer: Primary = amino acid sequence; secondary = alpha helices & beta sheets; tertiary = 3D folding; quaternary = multiple polypeptide chains.

15. How does gene regulation differ in prokaryotes vs. eukaryotes?

Answer: Prokaryotes use operons for coordinated gene expression; eukaryotes have complex regulation with transcription factors and epigenetics.

16. Role of RNA splicing.

Answer: Removes introns from pre-mRNA to produce mature mRNA for translation.

17. What is the Hardy-Weinberg principle?

Answer: Allele frequencies remain constant in a population without evolution, assuming no mutation, migration, selection, or genetic drift.

18. How do antibodies recognize and neutralize antigens?

Answer: Antibodies bind specifically to antigens, blocking pathogens or marking them for destruction by immune cells.

19. Describe feedback mechanisms in hormone regulation.

Answer: Negative feedback reduces hormone production when levels are high; positive feedback increases hormone production (e.g., oxytocin in labor).

20. Difference between sympatric and allopatric speciation.

Answer: Sympatric speciation occurs in the same area (behavioral/genetic isolation); allopatric speciation occurs due to geographic isolation.

1. What is the basic unit of life in all living organisms?

Answer: Cell

2. What planet is known as the Red Planet?

Answer: Mars

3. What gas do humans inhale that is essential for survival?

Answer: Oxygen

4. Which organ in the human body pumps blood?

Answer: Heart

5. What force pulls objects toward the center of the Earth?

Answer: Gravity

6. What is the chemical symbol for water?

Answer: HO

7. What type of energy is stored in food?

Answer: Chemical energy

8. What is the process by which plants make their own food using sunlight?

Answer: Photosynthesis

9. Which part of the plant absorbs water and nutrients from the soil?

Answer: Roots

10. What type of celestial body is the Sun?

Answer: Star

11. What is the main gas responsible for global warming?

Answer: Carbon dioxide (CO)

12. Which part of the human body helps you see?

Answer: Eyes

13. What is the boiling point of water at sea level in Celsius?

Answer: 100C

14. What do we call animals that eat only plants?

Answer: Herbivores

15. What is the largest organ in the human body?

Answer: Skin

16. What natural phenomenon causes rainbows?

Answer: Refraction and dispersion of sunlight in water droplets

17. Which planet is the largest in our solar system?

Answer: Jupiter

18. What are the building blocks of proteins?

Answer: Amino acids

19. What is the process called when a solid turns directly into a gas?

Answer: Sublimation

20. What type of rock is formed from cooled lava or magma?

Answer: Igneous rock

An alloy is an homogenous mixture od two elements.

For example :- Brass

We provide NCERT solution class 6-12th physics, chemistry and maths

Discuss why you selected this public health initiative policy, the population that it impacts the most and the societal history that drove this policy.

The public health policy I chose for this assignment is The Affordable Care Act (ACA).

Submission Instructions:

• Your initial post should be at least 200 words.
• Use citations where appropriate with APA formatting.
• You can expect feedback from the instructor within 48 to 72 hours from the Sunday due date.

What is science how science work in society and what are the main branches of science

Chapter 1 science class 10 Assamese medium questions answers very short answer questions and descriptive (short and long) questions