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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 2 Quiz: DNA Structure, Replication and DNA Repair Enzymes

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  • Questions count: 15
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1.
What is the structural characteristic of a restriction endonuclease recognition site?
It consists of 15-20 repetitive nucleotides.
It is a palindromic sequence reading identical 5' to 3' on both strands.
It contains only adenine and thymine bases.
It always begins with the start codon AUG.
2.
Why is the genetic code described as 'degenerate' or 'redundant'?
One codon can code for multiple different amino acids.
The genetic code decays as the cell ages.
The genetic code differs completely between bacteria and humans.
Multiple different codons can code for the same single amino acid.
3.
To distinguish between a white precipitate of barium sulfate (BaSO4) and a white precipitate of barium phosphate (Ba3(PO4)2), one should add:
Ammonium hydroxide solution
Dilute hydrochloric acid (Ba3(PO4)2 dissolves while BaSO4 remains insoluble)
Concentrated nitric acid in the dark
Boiling distilled water
4.
In a titration experiment, 20.0 mL of 0.15 M H2SO4 is completely neutralized by 30.0 mL of NaOH solution. The molar concentration of the NaOH solution is:
0.10 M
0.05 M
0.20 M
0.30 M
5.
Potters use high-temperature ovens called ________ to bake and harden clay vessels.
kilns
looms
blenders
fridges
6.
A diver descends to a depth of 30 meters in seawater (density = 1030 kg/m3). If atmospheric pressure is 1.013 x 105 Pa and g = 9.8 m/s2, the total absolute pressure experienced by the diver is approximately:
3.03 x 105 Pa
1.01 x 105 Pa
6.06 x 105 Pa
4.04 x 105 Pa (approx. 4.0 atmospheres)
7.
A metallic cube of side length 10 cm and density 7800 kg/m3 is completely submerged in water (density 1000 kg/m3). The buoyant force (upthrust) acting on the cube is (g = 10 m/s2):
68 N
100 N
10 N
78 N
8.
An ionic bond is formed primarily between:
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
Two non-metal atoms sharing pairs of valence electrons equally
Noble gas atoms at very low temperatures
9.
A metallic bond is physically described as the electrostatic attraction between:
Positive metal cations in the crystal lattice and the mobile sea of delocalized valence electrons
Protons and neutrons in the nucleus
Positive ions and negative non-metal anions
Dipole molecules in a polar liquid
10.
When examining a patient who suffers from severe weight loss, bulging eyes, rapid heart rate, and high temperature, the doctor diagnoses the condition as:
Exophthalmos caused by excessive secretion of the hormone thyroxine
Myxedema
Dwarfism
Diabetic urine
11.
Identical (monozygotic) twins arise genetically as a result of:
Fertilization of one egg by one sperm, then the resulting cell mass is divided into two parts that are identical in genetic makeup and sex.
Fertilization of one egg by two sperm
Fertilization of two eggs by two different sperm
Artificial parthenogenesis
12.
The enzyme used in the crucial experiment to verify the experiments of Avery and his colleagues, which completely analyzes DNA and does not affect protein or RNA, is:
Deoxyribonuclease enzyme
Ribonuclease enzyme
pepsin enzyme
DNA polymerase enzyme
13.
Connecting two complementary DNA strands by hydrogen bonds makes them:
Two exactly identical bars in the same direction
criss-crossing each lap
Two parallel strands in opposite directions that are chemically complementary
connected by peptide bonds
14.
The anticodon on the tRNA molecule carrying methionine is:
UAC
AUG
CAU
GUA
15.
The two main functional sites on the tRNA molecule are:
DNA polymerase site and binding site
Start location and stop location
The amino acid binding site is at the 3′ end' (sequence CCA), and anticodon site
Phosphate site and sugar site
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