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الاجابات 1b 2c 3d 4d 5c 6b 7b 8b 9d 10c 11 true 12false 13 true 14false 15true التوصيل 16c 17b 18E 19d 20a

Midterm Exam of General Biology Question 1: Choose the correct answer for each question: 10 marks 1. Is the scientific study of heredity and variation a. Genetics. b. Heredity c. Variation d. Biotechnology 2. Pathways consume energy to build complex molecules from simpler a. Catabolism b. Metabolism c. Anabolism d. None of them 3. The process by which DNA directs protein synthesis: a. Transcription b. Translation c. Gene expression. d. All 4. Ribosomes carry out protein synthesis in two locations: a. In the cytosol b. On the outside of the endoplasmic reticulum c. In chloroplast d. A and B 5. Directs cell activities: a. Mitochondria b. Chloroplasts c. Nucleus d. Golgi Apparatus 6. Helps in supporting, movement, and regulation of the cells. a. Cell walls of plants b. The extracellular matrix c. Intercellular junctions d. All the above 7. Contain the green pigment chlorophyll a. Mitochondria b. Chloroplasts c. Centrioles d. ER 8. Meiosis II results a. 2 daughter cells. b. 4 daughter cells. c. 6 daughter cells. d. None of them 9. The smallest working units of all living organisms a. Mitochondria b. Chloroplasts C. Nucleus d. Cells 10. There are two families of nitrogenous bases a. Pyrimidines b. Purines c. A & B d. None of them.

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Choice correct answers: 1. Kinetic energy K is the energy that the object gains when it:    A) stationary     B) moves     C) at rest     D) stops     Answer: B 2. If you apply a constant force F⃗ on an object, and thus, the object makes a displacement d⃗, then the work W done is:    A) W = F⃗ ⋅ d⃗     B) W = F⃗/d⃗     C) W = F⃗ + d⃗     D) W = F⃗ ⋅ d⃗     Answer: A 3. The work-kinetic energy theorem states that:    A) The change in the potential energy = the net work applied     B) The change in the work energy = the net work applied     C) The change in the kinetic energy = the net work applied     D) The change in the mechanical energy = the net work applied     Answer: C 4. The work done by a General Variable Force is:    A) W = F⃗ ⋅ d⃗     B) W = ∫F(x)   dx from x₁ to x_f     C) W = mgd ⋅ cos(θ)     D) W = mgd ⋅ sin(θ)     Answer: B 5. The SI unit of kinetic energy is:    A) Joule     B) Watt     C) kg·m/s     D) m/s     Answer: A 6. A car of mass 1500 kg starts moving from rest with a constant acceleration of 2 m/s² and has a final velocity of 80 m/s. What is the car's kinetic energy?    A) 21 × 10⁵   J     B) 12 × 10⁵   J     C) 36.75 × 10⁵   J     D) 48 × 10⁵   J     Answer: D 7. A force F = 15 N acts on a box as shown. Find the work done by this force when the box moves for a horizontal distance of 3 m (in the positive direction of x-axis) if θ = 65^\circ:    A) 25.81 J     B) 22.5 J     C) 19.01 J     D) 20.10 J     Answer: C 8. Gravitational Potential Energy U is:    A) U = ½ mgy     B) U = mgy     C) U = 2mgy     D) U = mg     Answer: B 9. A crane takes 2.5 s to lift a box of 1500 N for a vertical distance of 4 m. What is the work done by the crane during this lift?    A) 9000 J     B) 7500 J     C) 6000 J     D) 7000 J     Answer: B 10. In question 9, what is the average power of the crane during this lift?     A) 3000 W      B) 2400 W      C) 3600 W      D) 2600 W      Answer: B 11. Potential energy is "stored" in the object and can transfer to:     A) acceleration      B) power      C) mass      D) kinetic energy      Answer: D 12. The mechanical energy E_(mec) of an object is equal to the sum of its:     A) work W and the kinetic energy K      B) potential energy U and the work W      C) potential energy and the kinetic energy K      D) force F and the kinetic energy K      Answer: C 13. When the object is not moving (stationary), its kinetic energy is:     A) Zero      B) Constant      C) 6 J      D) 0.5 J      Answer: A 14. In an isolated (no external force) system:     A) W = Δ Eₒrec     B) 0 = Δ Eₘₐₓ     C) Δ K + Δ U = Δ E_(mec)     D) W = Δ E_(abec) + Δ Eₜₕ     Answer: B 15. The average power P_(avg):     A) P_(avg) = Δ F Δ t     B) P_(avg) = W/(Δ t)     C) P_(avg) = (Δ E)/(Δ w)     D) P_(avg) = (Δ t)/(Δ E)     Answer: B 16. A child of mass m is released from rest at the top of a water slide, at height h = 14m. Assuming that the slide is frictionless because of the water on it, find the child's speed at the bottom of the slide.     A) 13.12 m/s      B) 14.00 m/s      C) 15.33 m/s      D) 16.56 m/s      Answer: D 17. A man pushes a wood box of mass m = 14 kg across the floor with a constant horizontal force F of magnitude 40 N. In a straight-line displacement of magnitude d = 0.8 m, the speed of the box decreases from v₀ = 0.6 m/s to v = 0.2 m/s. How much work is done by force F?     A) 24 J      B) 28 J      C) 32 J      D) 34 J      Answer: C 18. In question 17, what is the increase Δ Eₜₕ in the thermal energy of the box and floor?     A) 26.24 J      B) 30.24 J      C) 34.24 J      D) 38.24 J      Answer: B 19. A crane takes 3.5 s to lift a box of a mass of 159 kg for a vertical distance of 7 m. What is the change in mechanical energy?     A) 10770.2 J      B) 10907.4 J      C) 10809.2 J      D) 10633.0 J      Answer: B 20. In equation 19, what is the average power of the crane during this lift?     A) 3116.4 W      B) 3038.0 W      C) 3103.2 W      D) 3077.2 W      Answer: A

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