MCQ Bank
What environmental elements were present in early Earth simulations?
- A) Cold climate and snow
- B) Thunderstorms, volcanic eruptions, no ozone
- C) Rainforests and rivers
- D) Glaciers and wind
According to the fossil record, life on Earth began at least:
- A) 2.5 billion years ago
- B) 4.0 billion years ago
- C) 4.6 billion years ago
- D) 3.5 billion years ago
What is the role of plasmids in antibiotic resistance?
- A) They kill bacteria
- B) They produce antibiotics
- C) They carry resistance genes
- D) They absorb toxins
Why is it important to study the Hadean Eon and early life?
- A) To understand how life originated under harsh conditions
- B) To calculate Earth’s mass
- C) To study current pollution levels
- D) To find oil and minerals
According to Darwin, what drives sexual dimorphism?
- A) Habitat destruction
- B) Food scarcity
- C) Shortage of mates
- D) Predator-prey conflict
What type of rocks are fossils typically preserved in?
- A) Sedimentary
- B) Metamorphic
- C) Volcanic
- D) Igneous
What leads to the formation of new species from existing ones, according to the Synthetic theory of Evolution?
- A) Artificial selection only
- B) Genetic variation in the population
- C) Extinction events
- D) Hybrid vigor
What is a point mutation?
- A) A change of a single base in DNA
- B) A deletion of a chromosome
- C) A mutation that affects the entire gene
- D) Duplication of multiple genes
If allele frequencies change between generations, what does this indicate?
- A) Genotype frequencies are fixed
- B) The population is in equilibrium
- C) Evolutionary forces are acting on the population
- D) Population stability
What is gene flow?
- A) Flow of alleles in and out of a population
- B) Natural selection acting on alleles
- C) Mutation within gametes
- D) Genetic drift in a large population
What do paleontologists study?
- A) Climate
- B) Fossils
- C) Ecosystems
- D) Living organisms
What could be a long-term result of gene flow between two geographically isolated populations?
- A) New species evolve
- B) Equal allele distribution
- C) Genotype extinction
- D) Increased divergence
What does p² represent in the Hardy-Weinberg equation?
- A) Allele frequency of recessive
- B) Mutation rate
- C) Heterozygous genotype frequency
- D) Homozygous dominant genotype frequency
Convergent evolution produces:
- A) Homologous structures
- B) Analogous structures
- C) Vestigial organs
- D) Recombinant chromosomes
What is meant by the term “gene pool”?
- A) The total number of species in an ecosystem
- B) The complete set of genes in a population
- C) Genes that are passed on from environment
- D) A place where genes are stored
Which of the following processes affect both microevolution and macroevolution?
- A) Photosynthesis
- B) Erosion
- C) Natural selection and mutation
- D) Plate tectonics
Which process is mainly responsible for the evolution of sexual dimorphism?
- A) Environmental shift
- B) Migration
- C) Sexual selection
- D) Genetic mutation
What happens when a DNA portion is deleted from a chromosome?
- A) It removes genes and disrupts function
- B) It results in protein elongation
- C) It initiates DNA repair
- D) It duplicates all genes
What is the gene pool of a population?
- A) The most common alleles in a species
- B) The sum of all genes present in all individuals of a population
- C) Only dominant genes in a population
- D) All the genotypes of a few individuals
What is genetic variation?
- A) Variation in diet of organisms
- B) Differences in the genetic makeup within a population
- C) Mutation in only plant species
- D) Differences in height among species