Which species is believed to be the closest ancestor to modern humans?
Neanderthals
Homo erectus
Australopithecus afarensis
Homo habilis
Correct Answer :
C. Australopithecus afarensis
Related Questions
Which microorganism is responsible for the majority of human yeast infections?
Bacteria
Virus
Fungus
Protist
The study of the geographic distribution of species is known as:
Biogeography
Ecology
Ethology
Taxonomy
Which type of learning occurs when an animal associates a neutral stimulus with a meaningful stimulus to produce a response?
Classical conditioning
Operant conditioning
Habituation
Imprinting
Which of the following is NOT a function of the cell wall in plant cells?
Providing structural support
Regulating osmotic balance
Facilitating cell communication
Protecting against pathogens
What is the term for the shedding of the uterine lining in the absence of pregnancy, resulting in menstruation?
Ovulation
Fertilization
Menarche
Menstruation
Which of Mendel's laws states that alleles for different genes segregate independently during gamete formation?
Law of Dominance
Law of Independent Assortment
Law of Segregation
Law of Inheritance
What is the term for the process by which an embryo implants itself in the uterine lining and begins to develop?
Ovulation
Fertilization
Implantation
Menstruation
What is the term for the maximum number of individuals of a species that an ecosystem can support indefinitely?
Carrying capacity
Population density
Limiting factor
Exponential growth
What is the primary function of the plant cuticle?
Gas exchange
Water retention and protection
Photosynthesis
Nutrient absorption
The relationship between a bee and a flower, where the bee obtains nectar and pollen while aiding in pollination, is an example of:
Mutualism
Parasitism
Competition
Commensalism
What is the term for a disease-causing microorganism?
Antibiotic
Parasite
Pathogen
Virus
What term describes the process by which animals adjust their internal biological clocks to match the daily cycle of light and dark in their environment?
Hibernation
Migration
Circadian rhythm
Nocturnal behavior
What is the term for the process by which modern humans gradually replaced archaic humans, such as Neanderthals, through migration and competition?
Speciation
Coevolution
Extinction
Out-of-Africa hypothesis
Which of the following is a bacterial disease that primarily affects the respiratory system and can be prevented by vaccination?
Tuberculosis
Malaria
Cholera
Whooping cough (Pertussis)
What is the term for a change in the sequence of DNA that can be passed on to offspring?
Gene flow
Genetic drift
Mutation
Natural selection
What is the term for the transfer of pollen from the male reproductive organ to the female reproductive organ of a flower?
Fertilization
Pollination
Germination
Embryo development
Which cell organelle contains digestive enzymes and is involved in cellular waste disposal?
Mitochondria
Nucleus
Lysosome
Chloroplast
Which term refers to structures that have no apparent function but resemble functional structures in other organisms?
Homologous structures
Analogous structures
Vestigial structures
Adaptive structures
What is the term for the process by which plants lose water vapor through small openings in their leaves?
Transpiration
Photosynthesis
Respiration
Osmosis
Which type of muscle is responsible for voluntary movements in the body?
Smooth muscle
Cardiac muscle
Skeletal muscle
Involuntary muscle
The smallest unit of a chemical element that retains the properties of that element is called:
Atom
Molecule
Cell
Tissue
What is the main function of the respiratory system?
Regulation of blood sugar levels
Transportation of oxygen and carbon dioxide
Digestion of food
Filtration of blood
Which level of ecological organization includes all the biotic and abiotic factors in a given area?
Population
Community
Ecosystem
Biosphere
What is the primary driver of the current global biodiversity crisis?
Habitat loss
Climate change
Pollution
Invasive species
Which of the following is a direct benefit of biodiversity to humans?
Increased greenhouse gas emissions
Decreased agricultural productivity
Development of new medicines
Soil erosion
Which of the following is NOT a method of preventing the spread of infectious diseases?
Vaccination
Antibiotic use
Handwashing
Quarantine
In a DNA molecule, adenine (A) pairs with:
Thymine (T)
Cytosine (C)
Guanine (G)
Uracil (U)
Which organelle is responsible for protein synthesis?
Golgi apparatus
Ribosome
Endoplasmic reticulum
Lysosome
Which type of behavior involves the establishment and maintenance of a territory for mating and/or obtaining resources?
Agonistic behavior
Courtship behavior
Dominance hierarchy
Territorial behavior
What is the primary function of the root system in plants?
Photosynthesis
Anchoring the plant and absorbing water and nutrients
Producing flowers and fruits
Transporting sugars