Introduction To Biology MCQs
Introduction To Biology MCQs
Try to answer these 400+ introduction To Biology MCQs and check your understanding of the Introduction To Biology subject. Scroll down and let's begin!
1: For each glucose that enters glycolysis, _____ nadh + h+ are produced by the citric acid cycle.
A. 7.0
B. 8.0
C. 9.0
D. 6.0
2: Fungi are made of bundles of threadlike ________.
A. Mycelia
B. Hyphae
C. Chitins
D. Lichens
3: If a tunicate's pharyngeal gill slits were suddenly blocked, the animal would have trouble _____.
A. A mineralized, bony skeleton
B. Bipedal locomotion
C. Respiring and feeding
D. Repositioning of Formen magnum
E. Placoderms
4: In an ecosystem, all incoming energy will eventually be __________.
A. Dissipated into space as heat
B. Respiration
C. Temperature and moisture
D. Nitrite is converted to nitrate (NO₃⁻) by nitrifying bacteria.
E. Fungi and prokaryotes
5: In signal transduction, phosphatases _____.
A. Amplify the second messengers such as cAMP
B. Move the phosphate group of the transduction pathway to the next molecule of a series
C. Inactivate protein kinases and turn off the signal transduction
D. Prevent a protein kinase from being reused when there is another extracellular signal
6: In a cladistic approach to systematics, an outgroup is __________.
A. Species into groups that each include an ancestral species and all of its descendants.
B. Because many of these changes do not affect fitness.
C. Systematics is a discipline within taxonomy.
D. Nucleotide substitutions in a gene occur at a relatively constant rate
7: Bacteria that __________ tend to have abundant internal membranes.
A. Are photosynthetic
B. Crenarchaeota
C. Delta
D. Methanogens
8: Extracellular pathogens such as viruses and bacteria in body fluids are attacked by _____.
A. antibodies from plasma cells antibodies are part of the "humoral" immune responses
B. Circulating antibodies encounter microorganisms in body fluids and
C. complex with them to "mark" them for further
9: In a newly fertilized egg, the vitelline layer _____.
A. Lifts away from the egg and hardens to form a fertilization envelope
B. Has receptor molecules that are specific for binding acrosomal proteins
C. Early blastomeres can form a complete embryo if isolated
D. Is composed of about 1000 cells, in which the developmental origin of each cell has been mapped
10: Co2 in the atmosphere is absorbed by ________ and converted into biomass.
A. Other atmosphere gases
B. The ozone layer
C. Photosynthetic organisms
11: Darwin believed that ________________ was the primary cause of evolution.
A. Natural selection
B. Mutation
C. Genetics
D. Fossil evidence
12: Meiosis ii typically produces _____ cells, each of which is _____.
A. Diploid
B. Four Haploid
C. Gametes
D. Meiosis
13: Over the past decade, the number of park visitors has _______ and park budgets have ________.
A. Increasing because of logging and grazing.
B. Are highly adapted to their special environment.
C. United Nations Environment Program.
D. The disappearance of palatable herbs.
E. Increased by one third; decreased by about 25%
14: Oyster populations are primarily, if not exclusively, composed of _____.
A. Larval and juvenile oysters
B. Adults
C. Prereproductive oysters
D. Larvae
15: A leech that attaches itself to a swimmer is an example of __________.
A. An endoparasite.
B. Prey.
C. An ectoparasite.
D. A pathogen.
E. A parasitoid.
16: A neuron's nucleus is located in its _____.
A. Cell body
B. Axon
C. Myelin sheath
D. Dendrite
E. Synaptic terminals.
17: A noncompetitive inhibitor decreases the rate of an enzyme reaction by _____.
A. ΔG is the change in free energy.
B. It is lost to the environment.
C. It may be used to form a phosphorylated intermediate.
D. By changing the shape of an enzyme
18: A series of reciprocal evolutionary adaptations in two species is called _____.
A. Predation
B. Coevolution
C. Interspecific competition
D. Community diversity
E. Resource partitioning
19: A unique feature of craniates is _____
A. Segmentation
B. A closed circulatory system
C. The neural crest
D. A vertebral column composed of bone
20: A(n) _____ reaction occurs spontaneously
A. Anabolic
B. Kinetic
C. Exergonic
D. Chemical
21: A(n) ______ is to bacteria as a ______ is to animal cells.
A. RNA . . . a polypeptide
B. Prophage . . . provirus
C. Via a lysogenic cycle
D. Uracil . . . thymine
E. Thymine . . . cytosine
22: About _____ molecules in a glass of water are dissociated.
A. 1 in 500,000,000.
B. Adhesion
C. Hydrogen ion
D. Hydroxide ion
23: According to this phylogenetic tree, annelids are most closely related to _____.
A. Nematoda
B. Arthropoda
C. Rotifers
D. Arthropods
E. Annelida
24: Adding a base tends to _____ of a solution.
A. A compound that donates hydrogen ions to a solution
B. Hydrophobic
C. Hydrophilic substances are polar.
D. Lower hydrogen ion concentration and increase the pH
25: Adding bile to triglycerides _______.
A. Chemically modifies the triglycerides
B. Causes them to clump
C. Increases the surface area of the triglycerides
26: After chromosomes are duplicated, each of the new copies is called a _____.
A. DNA polymerase
B. A normal female
C. Chromosomes
D. Sister chromatid
27: All of the following are hydrogen bonding properties except __________.
A. Nonpolar covalent bonding
B. 10,000,000 times as much
C. Surface tension
D. 100 times less H+
28: All of the following are ways that humans reduce biodiversity in ecosystems except _____.
A. Release them to the wild
B. Captive breeding programs
C. "Ecosystem engineers" can be as important as keystone species for the survival of the ecosystem.
D. Habitat fragmentation caused by building a road through a forest
29: An ectothermic organism would have the advantage over an endothermic organism when ______.
A. Food is scarce year-round
B. Relies on outside heat
C. Solar rays
D. Constant or relatively consistent body temperature
30: An f+ bacterial cell __________.
A. Acts as a donor during conjugation
B. Vertical gene transfer
C. Conjugation
D. Horizontal gene transfer
31: Anything that prevents atp formation will most likely ______.
A. Result in cell death.
B. Force the cell to rely on lipids
C. Force the cell to rely on lipids for energy
32: Arrow a is indicating a(n) _____ protein
A. Structural
B. Dehydration synthesis
C. Transport
D. Amino acids
33: As cleavage continues, a zygote forms into a solid multicellular ball called a(n) _____.
A. Gastrula
B. Blastula
C. Morula
D. Blastopore
34: As you stroll through a moist forest, you are most likely to see a _____.
A. Zygote of a green alga.
B. Gametophyte of a moss.
C. Sporophyte of a liverwort
35: Calcium ions that act as second messengers are stored in _____.
A. Peroxisomes
B. Endoplasmic reticula
C. Lysosomes
D. Chloroplasts
E. Mitochondria
36: In this activity, the solutes were transported through the dialysis membrane by _______.
A. Osmosis
B. Facilitated diffusion
C. Active transport
D. Simple diffusion
37: Photosynthesis uses ____________ to produce atp, nadph, and o?.
A. Light energy.
B. Carbon fixation
C. Electrons
D. Calvin cycle
E. Chlorophyll
38: Prokaryotes found inhabiting the great salt lake would be _____.
A. Cyanobacteria
B. Exterme halophiles
C. Extermophiles
D. Methanogens.
39: Similar gill pouches in embryos of a chick, human, and cat are an example of _____.
A. Developmental homology
B. The inheritance of acquired characteristics
C. Genetic homology
D. Structural homology
40: Some liver cells ingest bacteria, a function probably accomplished by _____.
A. Phagocytosis.
B. Hypotonic
C. A hypertonic sucrose solution
D. Exocytosis
41: The counter-regulatory functions of the pancreas refer to the fact that it _____.
A. Releases one hormone that reduces glucose levels in the blood and another
B. Depolarize when exposed to light
C. Respond to all wavelengths of light
D. Use photospins as the visual pigments in both rods and cones
E. Release gluatamate as a primary neurotransmitter
42: The diagnostic feature of chondrichthyes is _____.
A. Jaws
B. A lateral line system
C. A streamlined, torpedo-shaped body
D. A swim bladder
43: The ease with which humans travel across the globe is likely to increase _____.
A. Natural selection
B. Genetic drift
C. Gene flow
D. Mutation
44: The extracellular matrix of animal cells ______.
A. Protects and support cells
B. Smooth endoplasmic reticulum
C. Golgi apparatus
D. Mitochondria
45: The inability of organisms to evolve anything that could be an advantage reflects _____.
A. The population size is small
B. Descent with modification
C. The limits of historical constraints
D. Gene variability = 0%; number of alleles = 2
46: The instructions for making amino acids are on about 3 billion pairs of chemicals called _____.
A. Stem
B. Polymorphic
C. Allele
D. Base
47: The number of genes correlates with _____.
A. The size of the genome in prokaryotes.
B. Sequences Related to Transpo Elements
C. Comparing Developmental Processes
D. Comparing Genomes Within a Species
48: The primates that spend the most time walking upright are the _____.
A. Prosimians ( Prosimian fossils date back to the end of the dinosaurs.)
B. Hominids ( Humans are hominids.)
C. Homo sapien ( Humans are classified as Homo sapiens.)
D. None of these
49: The term mixotroph indicates that a protist __________.
A. Combines photosynthesis and heterotrophic nutrition
B. Morphological studies of the cytoskeleton.
C. Pseudopodia, Cilia, Flagella, Undulating membrane.
D. Frequently changing their surface proteins.
50: The vegetal pole of a frog zygote differs from the animal pole in that _____.
A. The vegetal pole has a higher concentration of yolk.
B. The blastomeres originate only in the vegetal pole.
C. The posterior end of the embryo forms at the vegetal pole.
D. The vegetal pole cells undergo mitosis but not cytokinesis.
E. The polar bodies bud from this region.
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