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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: Identification of DNA as Genetic Material

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  • Questions count: 20
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1.
The nitrogen molecule (N2) contains a:
Triple covalent bond (one sigma bond and two pi bonds) sharing 3 electron pairs
Coordinate dative bond
Double covalent bond
Single ionic bond
2.
Asexual reproduction differs from sexual reproduction in that:
Provides great genetic diversity
Expensive in energy and time
It always requires the formation of gametes
It is based on a single parental individual and maintains genetic stability over generations because it is based on mitosis
3.
The direct cause of myxedema in an adult is:
Hyperactivity of the parathyroid gland
Severe deficiency in thyroxine secretion in adulthood
Excessive increase in growth hormone
Insulin deficiency
4.
Immune chemicals secreted by virus-infected cells to warn neighboring healthy cells to produce enzymes that inhibit virus replication.S is:
Interleukins
Chemokines
Interferons
Complements
5.
The covalent chemical bond that connects the heavy and light peptide chains in an antibody molecule is:
Weak hydrogen bonds
Ionic bonds
Disulfide Bonds - S-S
Additional peptide bonds
6.
Hershey and Chase successfully exploited which elemental difference to distinguish DNA from protein in bacteriophages?
Phosphorus in DNA vs. Sulfur in proteins
Nitrogen in DNA vs. Carbon in proteins
Oxygen in DNA vs. Hydrogen in proteins
Potassium in DNA vs. Sodium in proteins
7.
Charles's Law establishes that at constant pressure, the volume of a given mass of gas is directly proportional to its:
Celsius temperature only
Absolute temperature in Kelvin (T_K = t_C + 273.15)
Atmospheric density
Square of the absolute temperature
8.
Pascal's principle states that when pressure is applied to an enclosed, incompressible fluid, it is transmitted:
Undiminished to every portion of the fluid and to the walls of the containing vessel
Strictly to compressible gases
With an exponential decay as distance increases
Only downwards towards the bottom of the vessel
9.
The phenomenon of natural parthenogenesis in honey bees results in:
Female workers only
Fertile queens (2N)
Diploid males
Bees are always male, and their somatic cells are haploid (1N) resulting from an unfertilized egg that grows mitotically.
10.
A gas cylinder contains 10 liters of gas at a pressure of 3.0 atm. If the volume is reduced to 2.5 liters at constant temperature, the new pressure inside the cylinder will be:
12.0 atm
1.2 atm
7.5 atm
6.0 atm
11.
The decomposition of the corpus luteum in the ovary of a non-pregnant woman at the end of the menstrual cycle results in:
A sharp drop in the concentration of the hormone progesterone leads to the breakdown of the uterine lining, the rupture of its capillaries, and the occurrence of menstruation
Placenta formation
Secretion of huge amounts of LH
Continued growth of the uterine lining
12.
Interstitial cells in the human male testicle respond directly and secrete testosterone under the influence of a pituitary hormone:
Luteinizing hormone (LH)
Prolactin hormone
Growth hormone
FSH hormone
13.
In a U-tube manometer containing two immiscible liquids in equilibrium, the heights of the liquid columns measured above the separating surface are:
Directly proportional to their densities
Proportional to the square of the cross-sectional area of the tube
Inversely proportional to their respective densities (h1 / h2 = rho2 / rho1)
Equal regardless of the liquids used
14.
The gland that secretes both external ductal secretion and non-ductal hormonal secretion directly into the blood is:
pituitary gland
Adrenal gland
Thyroid gland
Pancreas (common/mixed gland)
15.
The main chemical reducing agent inside the Midrex furnace and its industrial source are respectively:
Pure carbon monoxide (CO) produced from metallurgical coke
Carbon dioxide mixed with limestone
Hydrogen gas produced from the electrolysis of water
Water gas (mixture of CO and H2) produced from natural gas (methane CH4)
16.
In the life cycle of the Plasmodium malaria parasite, the human infective phase is:
Merozoites
Kinetic phase (okinete)
Gametophytes
Sporozoites
17.
The cells that suppress and inhibit the immune response after eliminating the microbe and secrete lymphokine proteins are:
Helper T cells (Th)
Suppressor T cells
Neutrophil cells
Plasma cells
18.
Rotational cytoplasmic movement inside living plant cells (such as Elodea plants) is indicated by:
Movement of chloroplasts immersed in the cytoplasm stream in a constant rotational direction
Stomata open
Mitochondrial division
Change in cell wall thickness
19.
The chemical compound secreted by mast cells and basal white blood cells that is responsible for the widening of blood vessels and symptoms of inflammation is:
Interleukin
Heparin
Albumin
Histamine
20.
Natural killer (NK) cells attack and kill cancer cells and virus-infected cells by:
Histamine secretion
Swallow the cells whole
Secretion of specialized digestive enzymes without the need for prior specific antigen recognition
Secretion of antibodies
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