Comparison of the amino acid sequence of cytochrome c in different species is an example of which evidence of evolution?
Correct answer A. Biochemical (molecular) evidence
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MDCAT Biology MCQs
Page 21 of MDCAT Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 21 of 54
- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
Pharyngeal pouches (gill slits) and a post-anal tail appear in the early embryos of fish, birds and humans. This provides ____ evidence of evolution.
Correct answer C. embryological
The Galápagos finches, which evolved many beak forms from a single ancestral species to exploit different foods, illustrate ____.
Correct answer C. adaptive radiation
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Which of the following is NOT a condition for a population to remain in Hardy-Weinberg equilibrium?
Correct answer B. Strong natural selection for one allele
In a population in Hardy-Weinberg equilibrium, 16% of individuals show a recessive phenotype. What is the frequency of heterozygotes?
Correct answer D. 0.48
A recessive disorder affects 1 in 2500 people in a population in Hardy-Weinberg equilibrium. What is the approximate frequency of carriers?
Correct answer C. 0.039
In a population of 1000 individuals there are 360 AA, 480 Aa and 160 aa. What is the frequency of allele A?
Correct answer C. 0.6
If the frequency of allele B in a population at Hardy-Weinberg equilibrium is 0.7, what is the expected frequency of BB individuals?
Correct answer C. 0.49
In a population at Hardy-Weinberg equilibrium, 9% of people show a recessive trait. What percentage show the dominant phenotype?
Correct answer D. 91%
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In a population of 500 at Hardy-Weinberg equilibrium, the frequency of allele t is 0.2. How many heterozygous Tt individuals are expected?
Correct answer A. 160
In a population at Hardy-Weinberg equilibrium, 75% of individuals show the dominant phenotype. What is the frequency of the recessive allele?
Correct answer A. 0.5
At Hardy-Weinberg equilibrium, the frequency of heterozygotes is greatest when ____.
Correct answer C. p = q = 0.5
Which scientist carried out the 1953 experiment in which electric sparks passed through a mixture of CH₄, NH₃, H₂ and water vapour produced amino acids?
Correct answer C. Stanley Miller
The early atmosphere assumed in the Oparin-Haldane hypothesis is best described as ____.
Correct answer D. reducing, with little or no free oxygen
Oparin called the colloidal droplets of organic molecules that may have been precursors of the first cells by what name?
Correct answer D. Coacervates
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Which experiment, using flasks with long S-shaped necks, disproved spontaneous generation of microorganisms?
Correct answer D. Pasteur's swan-neck flask experiment
Francesco Redi showed that maggots do not arise from rotting meat by ____.
Correct answer D. covering meat with gauze so flies could not lay eggs on it
The ‘RNA world’ hypothesis is supported mainly by the discovery that RNA can ____.
Correct answer A. both store genetic information and act as a catalyst
The first living organisms on Earth are believed to have been ____.
Correct answer C. anaerobic heterotrophic prokaryotes
Which group of organisms is credited with adding most of the free oxygen to Earth’s early atmosphere?
Correct answer B. Cyanobacteria