A. Lysosome
B. Nucleus
C. Centrioles
D. Mitochondria
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ATP is produced by a series of reactions that occur in the mitochondria. The mitochondria have a double membrane structure, with an inner membrane that is folded into cristae. These cristae contain the enzymes and proteins that are involved in the process of cellular respiration, which converts glucose and oxygen into ATP and carbon dioxide.
Therefore, the Correct Answer is D.
Which of the following types of cells stimulates other immune cells to attack and destroy foreign agents?
A. Cytotoxic T-cells
B. Plasma cells
C. Natural killer cells
D. Helper T-Cells
The Correct Answer is D.Helper T cells are important cells that stimulate the action of other immune cells. For instance, they not only help activate B cells to secrete antibodies and macrophages to destroy ingested microbes, but they also help activate cytotoxic T cells to kill infected target cells.
An experienced mountaineer decides to climb Mount Everest, taking the same route in the same season and with similar materials and equipment used in a fatal 1924 expedition Which of the following is the scientific purpose of such a climb?
A. To measure the oxygen levels at high elevation
B. To assess why the earlier expedition failed
C. To show that modem technology makes climbing safer
D. To identify routes that can be explored in future climbs
The Correct Answer is B.The experienced mountain climber is replicating the conditions of the past expedition to understand why that earlier attempt was unsuccessful.
in which of the following locations does fertilization of an egg cell typically occur?
A. Fallopian Tube
B. Ovary
C. Uterus
D. Cervical canal
The Correct Answer is A.Fertilization occurs in the fallopian tube and not in the ovary, uterus, or cervical canal.
Using the equation PH = -log (H+), a solution with a (H+)= 10+ M has a PH of which of the following?
A. 9
B. 5
C. 1
D. 10
The Correct Answer is C.Concentration of H+ in the solution = 10 −1 M
pH= -log(10 −1)
pH= -(-1)
=1
A represents atomic mass and 2 represents an atomic number, which of the following describes an atom after a proton is emitted?
A. A-1,2-1
B. A-1,2+1
C. A,2-1
D. A+1,2-1
The Correct Answer is A.This is because when a proton is emitted from an atom, the atomic mass decreases by one unit, and the atomic number decreases by one unit. The atomic mass is the sum of protons and neutrons in the nucleus, and the atomic number is the number of protons in the nucleus. Therefore, if a proton is lost, both numbers decrease by one.
Which of the following describes one difference between skeletal muscles and cardiac muscles?
A. Skeletal muscles are found in the viscera whereas cardiac muscles are found in the cranium
B. Cardiac muscles contain intercalated discs, whereas skeletal muscles do not
C. Cardiac muscles are voluntary, whereas skeletal muscles are involuntary
D. Skeletal muscles are autorhythmic, whereas cardiac muscles are not
The Correct Answer is B.Cardiac muscles have intercalated discs that enable them to contract in a coordinated manner. Skeletal muscles do not have intercalated discs, as their contraction is under voluntary control and does not require the same level of synchronization seen in the involuntary contraction of cardiac muscle.
Which of the following would result in an increase in the chemical reaction?
A. Adding more of the product
B. Decreasing the concentration of the reactant
C. Sealing the reaction in an airtight container
D. Using a mortar and pestle to grind a solid reactant to a powder
The Correct Answer is D.Crushing a solid reactant into powder increases the surface area of the reactant, thereby increasing chemical reaction. This is because more of the reacting molecules or ions are exposed to the other reactant, which increases the chance of particles colliding and leads to more successful collisions per second.
Which of the following pathways best represents the expected flow of blood from the human heart to an organ?
A. Blood pumped from the heart first enters arterioles that then merge to form arteries that deliver blood to the organ
B. Blood pumped from the heart first enters arteries that then narrow to form arterioles that deliver blood to capillaries of the organ
C. Blood pumped from the heart first enters versus that then narrow to form venules that deliver blood to arteries to the organ
D. Blood pumped from the heart first enters arteries that then narrow to form arterioles that deliver blood to capillaries
The Correct Answer is B.From the heart, blood flows through major arteries, which then branch to give rise to arterioles, which then divide into capillaries that deliver blood to the target organ.
Which of the following is classified as a noninfectious disease?
A. Psoriasis
B. Brucellosis
C. Olkunginys
D. Dengue
The Correct Answer is A.Psoriasis is a chronic skin condition that causes red, scaly patches on the skin. It is not contagious, and it is not caused by any microorganism. It is believed to be an autoimmune disorder where the immune system attacks healthy skin cells.
Which of the following contains a human's hereditary information?
A. chromatin
B. Histones
C. ATP
D. Plasmids
The Correct Answer is A.Rationale
Chromatin refers to a complex of DNA and proteins in human cells. This material is packaged by histones to make up the chromosomes. The chromosomes then contain genetic information that is heritable.