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Katyanochek1 [597]
1 year ago
9

The term for genetic testing on embryos for genes that cause untreatable or severe diseases is:________

Biology
1 answer:
riadik2000 [5.3K]1 year ago
3 0

<em>a</em><em>n</em><em>s</em><em>w</em><em>e</em><em>r</em><em> </em><em>:</em>

preimplantation genetic testing ( pgt ) .

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The answer is B. Paramecium.

Explanation:

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The following are required steps in the sliding filament theory of muscle contraction:
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In muscles contraction the correct order of the steps are: A (Nerve impulse reaches the muscle), B (Action potential travels down T-tubules), C (Calcium binds to troponin), D (Tropomyosin moves).

Explanation:

Skeletal muscle contractions are based on different physiological and biochemical phenomena that happen in every cell. These phenomena are due to stimulation produced by somatic motor neurons, which axons get in contact with muscle fibers through a neuromuscular synapse.  In rest, attraction strengths between myosin and actin filaments are inhibited by the tropomyosin. When an action potential is originated in the central nervous system, it travels to the somatic motor neuron membrane: the muscle fiber, and activates the calcium channels releasing it in the neuron. Calcium makes vesicles to fuse with the membrane and release the neurotransmitter named acetylcholine (Ach) into the synaptic space in the juncture. Then, Ach binds to its receptors on the skeletal muscle fiber. This causes the ion channels to open, and positively charged sodium ions cross the membrane to get into the muscle fiber (sarcoplasm) and potassium get out. The difference in charges caused by the migration of sodium and potassium makes the muscle fiber membrane to become more positively charged (depolarized). The action potential caused by this depolarization enters the t-tubules depolarizing the inner portion of the muscle fiber. This activates calcium channels in the T tubules membrane, that make the calcium be released into the sarcolemma. At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to the troponin C, the troponin T alters the tropomyosin by moving it and then unblocks the binding sites. Myosin binds to the uncovered actin-binding sites, and while doing it ATP is transformed into ADP and inorganic phosphate. Z-bands are then pulled toward each other, thus shortening the sarcomere and the I-band, and producing muscle fiber contraction.

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3 years ago
A meal consisting of a cheeseburger, large fries, and a chocolate shake provides a total of 1120 kcal. Forty-eight percent of th
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Answer:

The answer to your question is 436.8 kcal of lipids

Explanation:

Data

Total number of calories = 1120 kcal

48 % carbohydrates

13 % proteins

? % lipids

Process

1.- Sum the percent of proteins and carbohydrates

            48% + 13% = 61 %

2.- Calculate the 61% of 1120

             1120 kcal -----------------  100%

                x            -----------------   61%

                x = (61 x 1120) / 100

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     kcal of lipids = 1120 - 683.2

                          = 436.8 kcal

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3 years ago
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