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Biology & Geology

Chapter 1 - Support and Movement in Living Organisms

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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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Chapter 7 - Geology, Earth Sciences and Ecology

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Quiz

Lesson 1 Quiz: Endocrine Glands, The Pituitary, Thyroid and Parathyroid Glands

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  • Questions count: 10
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1.
If a double-stranded DNA sample contains 28% Adenine, what is the exact percentage of Cytosine in this sample?
22%
56%
28%
44%
2.
If a, b, c form an arithmetic sequence, then the arithmetic mean b equals:
b = sqrt(a * c)
b = 2 a c / (a + c)
b = a + c
b = (a + c) / 2
3.
If a, b, c form a geometric sequence of positive real numbers, the geometric mean b equals:
b = (a + c) / 2
b = + sqrt(a * c)
b = a2 + c2
b = a * c
4.
The mechanical advantage (eta) of an ideal hydraulic press equals all of the following ratios EXCEPT:
Work done by the large piston / Work done on the small piston > 1
Distance moved by the small piston / Distance moved by the large piston (y1 / y2)
Area of the large piston / Area of the small piston (A / a)
Force on the large piston / Force on the small piston (F / f)
5.
Real gases behave most closely to an ideal gas under conditions of:
Extremely high pressure and low temperature
Zero gravitational acceleration
High pressure and near liquefaction point
Very low pressure and high temperature (where intermolecular attraction forces and molecular volumes become negligible)
6.
An ionic bond is formed primarily between:
Two non-metal atoms sharing pairs of valence electrons equally
Noble gas atoms at very low temperatures
A metal atom that loses electrons forming a cation and a non-metal atom that gains electrons forming an anion due to electrostatic attraction
Positive metal ions immersed in a sea of delocalized electrons
7.
Substances secreted by T helper cells (Th) and acting as a communication tool to activate neighboring B and T cells are:
Antibodies
Hemoglobin
Myoglobin
Interleukins
8.
The method of action of antibodies that is considered the most appropriate and most efficient in inactivating viruses and preventing their penetration into cells is:
Deposition method
Decomposition method
Neutralization method
Alignment method
9.
The substance that the plant secretes to close wounds in its woody stems and completely isolate the affected tissue from the air and microbes is:
Gum and cork
Ascorbic acid
Monosaccharides
Liquid auxins
10.
In gene cloning technology, a ligase is used to:
Linking the integrated sticky ends of a target gene to the sticky ends of a circular plasmid
Cut the plasmid
Breaking down proteins
mRNA transcription
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