Which of the following occurs by an active transport process? Transport of Na^+
ID: 181873 • Letter: W
Question
Which of the following occurs by an active transport process? Transport of Na^+ from a region of higher concentration to a region of lower concentration through a channel Simple diffusion of a steroid hormone in rough the plasma membrane Facilitated diffusion of Cl^+ down its concentration gradient transport of K^+ across the plasma membrane using cellular energy (ATP) Red blood cells placed in hypotonic solution will: remain the same shrink swell and burst cannot be predicted The process of transcription produces: DNA RNA Proteins Ribosomes Given the DNA sequence: GTCATG. what would be the sequence of the mRNA? CAGTAC CUGTUC CAGUAC GUCAUG If the coding region of mRNA was 150 nucleotides, how many amino acids would be found in the resulting polypeptide chain? 15. 50. 150. 450. Blood concentration of_ will increase with bone resorption (breakdown). Ca^2+ Cl^- K^+ Na^+ During infancy, bone deposition (formation) rate is bone resorption (breakdown) rate. about the same as lower than much lower than higher than A motor unit is: one neuromuscular junction the distance from one Z disc to the next one thick filament and all thin filaments with which it forms cross-bridges one nerve fiber and all muscle fibers innervated by it The strength of a muscle twitch increases in tripe and tetanus because the increased frequency of stimulation causes each stimulus to build on the previous one the concentration of Ca^2+ in the sarcoplasm increases the temperature increases efficiency of enzymes like the myosin ATPase all of the above When a muscle develops increased tension, but does not shorten, it is said to exhibit: tripe fatigue isometric contraction isotonic contraction Action potentials move along different axons at different speeds. The slowest speed of conduction will be found in: large unmyelinated axons small unmyelinated axons large myelinated axons small myelinated axonsExplanation / Answer
9. Option D.tranport of K+ across the plasmamembrane using celluar energy (ATP)
Active transport is the method of trnsport of ions against concentration gradient with the use of energy in the form of ATP.
10.C.Swell and burst.
Red blood cells absorb water and swell and burst. whereas, in the hypertonic solution, they shrink.
11.B.RNA
Transcription is the process of producing RNA from DNA.
12. option c) CAGUAC
in mRNA instead of T there would be U. G pairs with C and A pairs with U.
13.B.50
Each amino acid is coded by a set of 3 nucleotides. so 150/3 = 50.
14.A. Ca2+
Bone resorption is the breakdown of osteoclasts and release Ca2+ into the blood. So its concentration increases.
15.D.Higher than.
During infancy, the rate of bone formation is more than bone resorption.
16.D. One nerve fiber and all muscle fibers innervated by it.
17.D.all of the above
in tetanus, the neuromuscular junction will have uncontrolled release of acetyl choline and results in spastic paralysis
18.A.treppe
19.B.small unmylinated fibers.
Myelin sheath acts as insulator for conducction of electric impulses. unmyelinated neurons cannot conduct efficiently as electric impulse leaks. resistance to elctric flow is inversely proportional to diameter of the nerve.
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