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Biology & Geology (STEM)

Chapter 2 - Hormonal Coordination in Living Organisms

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Chapter 3 - Reproduction in Living Organisms

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Chapter 4 - Immunity in Living Organisms

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Chapter 5 - Molecular Biology - DNA Structure and Function

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Chapter 6 - Molecular Biology - RNA, Protein Synthesis and Genetic Engineering

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Quiz

Lesson 1 Quiz: Support in Plants and the Human Skeletal System

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1.
STEM Physiology Question 15: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
0 ATP molecules (relaxation is completely passive)
1 ATP molecule shared across all 50 fibers
10 ATP molecules per fiber
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
2.
STEM Biology Problem 2: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
240 Cytosine bases and 1,200 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
3.
STEM Physiology Question 11: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
0 ATP molecules (relaxation is completely passive)
10 ATP molecules per fiber
1 ATP molecule shared across all 50 fibers
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
4.
STEM Biology Problem 23: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
480 Cytosine bases and 1,800 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
5.
STEM Physiology Question 31: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
1 ATP molecule shared across all 50 fibers
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
0 ATP molecules (relaxation is completely passive)
10 ATP molecules per fiber
6.
STEM Biology Problem 10: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
360 Cytosine bases and 1,560 total hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
7.
STEM Physiology Question 17: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
10 ATP molecules per fiber
1 ATP molecule shared across all 50 fibers
0 ATP molecules (relaxation is completely passive)
8.
STEM Physiology Question 29: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
10 ATP molecules per fiber
1 ATP molecule shared across all 50 fibers
0 ATP molecules (relaxation is completely passive)
9.
STEM Physiology Question 1: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
0 ATP molecules (relaxation is completely passive)
1 ATP molecule shared across all 50 fibers
10 ATP molecules per fiber
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
10.
STEM Physiology Question 9: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
10 ATP molecules per fiber
0 ATP molecules (relaxation is completely passive)
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
1 ATP molecule shared across all 50 fibers
11.
STEM Biology Problem 4: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
240 Cytosine bases and 1,200 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
12.
STEM Biology Problem 36: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
360 Cytosine bases and 1,560 total hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
13.
STEM Physiology Question 38: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
0 ATP molecules (relaxation is completely passive)
10 ATP molecules per fiber
1 ATP molecule shared across all 50 fibers
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
14.
STEM Biology Problem 27: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
240 Cytosine bases and 1,200 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
15.
STEM Biology Problem 42: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
480 Cytosine bases and 1,800 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
16.
STEM Physiology Question 5: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
10 ATP molecules per fiber
0 ATP molecules (relaxation is completely passive)
1 ATP molecule shared across all 50 fibers
17.
STEM Physiology Question 39: In a skeletal muscle motor unit consisting of 1 motor neuron and 50 muscle fibers, what is the minimum number of ATP molecules required for one complete contraction-relaxation cycle per cross-bridge?
1 ATP molecule shared across all 50 fibers
2 ATP molecules (one for cross-bridge detachment and one for Ca2+ active transport back into the sarcoplasmic reticulum)
0 ATP molecules (relaxation is completely passive)
10 ATP molecules per fiber
18.
STEM Biology Problem 3: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
240 Cytosine bases and 1,200 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
480 Cytosine bases and 1,800 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
19.
STEM Biology Problem 16: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
480 Cytosine bases and 1,800 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
20.
STEM Biology Problem 29: A double-stranded DNA segment contains 1,200 nucleotides, of which 240 are Adenine. What is the total number of Cytosine bases and hydrogen bonds in this segment?
480 Cytosine bases and 1,800 hydrogen bonds
120 Cytosine bases and 960 hydrogen bonds
240 Cytosine bases and 1,200 hydrogen bonds
360 Cytosine bases and 1,560 total hydrogen bonds
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