Developmental Biology MCQs
Developmental Biology MCQs
Answer these 50 Developmental Biology MCQs and assess your grip on the subject of Developmental Biology. Scroll below and get started!
1: A blastomere is a _____ and a blastocyst is _____.
A. Hollow ball of cells; a cell resulting from cleavage
B. Fetal organ produced by cleavage; an embryonic organ produced by cleavage
C. Fetal membrane; an embryonic membrane
D. Cell produced by cleavage; a hollow ball of cells
E. Solid ball of cells; three-layered embryo.
2: A common reason that couples do not seek genetic counseling is that _____.
A. Pregnancy is unplanned
B. Genes of the embryo/fetus
C. Drug, cigar, genetic factor
D. Brain functioning
E. Use to be body weight
3: Among the following, the earliest consequence of the acrosomal reaction is _____.
A. Membrane depolarization.
B. The membrane of the egg depolarizing
C. Ectoderm → mesoderm → endoderm
D. The mesoderm gives rise to the notochord.
4: As it implants, the conceptus is nourished by means of __________.
A. Trophoblastic nutrition
B. Uterine milk
C. Nutrient diffusion from the endometrium
D. Placenta
5: Cell differentiation always involves __________.
A. The production of tissue-specific proteins
B. Lysis of the cell
C. Proto-oncogenes are necessary for the normal control of cell growth and division.
D. Proto-oncogenes can become oncogenes when a mutation or other genetic change increases the activity of the encoded protein
6: During gastrulation, invagination occurs at the _____.
A. Archenteron
B. Blastocoel
C. Endometrium
D. Blastopore
E. Trophoblast
7: During the early development of a human embryo, the _____ eventually forms the _____.
A. Epiblast ... ectodermal, mesodermal, and endodermal tissues
B. Hypoblast ... amniotic cavity
C. Trophoblast ... embryo proper
D. Epiblast ... placenta
E. Blastocoel ... archenteron
8: Ectoderm is to ________ as mesoderm is to ________.
A. Neural tissue; muscle tissue
B. Cardiovascular system; neural tissue
C. Mesoderm; endoderm
D. Neural tissue; epithelial tissue
E. Muscle tissue; neural tissue
9: Gap genes, segment-polarity genes, and homeotic genes all _____.
A. Gastrulation
B. Anterior
C. Posterior
D. Transcription
E. Segment
10: If a drosophila female has a homozygous mutation for a maternal effect gene, _____.
A. An old DNA strand is used as a template for the synthesis of a complementary new strand.
B. All of her offspring will show the mutant phenotype, regardless of their genotype.
C. Embryonic stem cells can differentiate into more cell types than adult stem cells.
D. Lifts away from the egg and hardens to form a fertilization envelope
E. Bind to other proteins or to a sequence element within the promoter called the TATA box
11: Muscle cells differ from nerve cells mainly because they __________
A. Lysis of the cell
B. Cells escape the control methods that normally regulate cells
C. Express different genes
D. When the cell synthesizes proteins that are specific to a particular cell type
12: Regulatory transcription factors _____.
A. Influence the assembly of the basal transcription complex
B. Bind to other proteins or to the TATA box
C. Off through their association in nucleosomes
D. None of these
13: A sperm cell's acrosome ________.
A. Fuses with the plasma membrane of the egg cell
B. Contains the sperm's nucleus and is the part of the sperm that enters the egg during fertilization
C. Contains the sperm's mitochondria
D. Contains enzymes that are released when the sperm encounters an egg and dissolves a hole in the jellylike matrix that surrounds the egg
E. Contains the fuel that powers the sperm
14: Heterozygous individuals with just one recessive allele __________ to their children. .
A. Can pass the trait
B. Can pass the information
C. Can pass the gene
15: The trp (tryptophan) operon is an example of a(n) __________ operon.
A. Anabolic pathway; feedback inhibition
B. Repressor protein; tryptophan; active corepressor
C. Substrate; repressor; inactive
D. Allolactose, the isomer of lactose
16: The bicoid gene is transcribed by _____.
A. Egg-polarity
B. Gastrulation
C. Nurse cells
D. Two-headed fly
17: The bicoid gene product is directly responsible for _____ in a developing drosophila embryo.
A. The combinatorial effects of specific MADS box gene expression in specific regions of the developing flower
B. One kind of floral organ is replaced by another.
C. The establishment of the anterior-posterior axis
D. To dissolve the coating of the egg
18: Prolactin is to milk __________ as oxytocin is to milk __________.
A. Production; ejection
B. A trait is controlled by the combined effects of multiple genes
C. Dilation, expulsion and placental stages
D. None of these
19: In the thoracic region, the __________ form(s) from the inner tube of the body.
A. Epiblast and hypoblast
B. The middle of week 3
C. Respiratory structures
D. Limb buds appear
20: During fertilization, the acrosomal contents _____.
A. Block polyspermy
B. Help propel more sperm toward the egg
C. Digest the protective jelly coat on the surface of the egg
D. Trigger the completion of meiosis by the sperm
21: During the period of the embryo, the __________ becomes the __________.
A. Endoderm; digestive system, lungs, urinary tract, and glands
B. Mesoderm; nervous system, lungs, internal organs, and skin
C. Both A & B
22: In the process of embryonic development the _______ develops first
A. Blastocyst
B. Gastrula
C. Blastocoel
D. Morula
23: Neural tissue is formed by the ________.
A. Ectoderm
B. Gastrula
C. Blastocoel
D. Morula
24: Myod promotes muscle cell development by __________.
A. Proximal control elements and distal enhancers
B. Does not respond to the chemical signals that control cell division
C. Turning on the expression of multiple muscle-related genes
25: The first stage of embryonic development is _____. this process produces _____.
A. Neurulation ... a neurula
B. Gastrulation ... a three-layered embryo
C. Cleavage ... a cluster of cells
D. Parturition ... a fetus
E. Ovulation ... a zygote
26: The formation of endodermal and ectodermal germ layers occurs at ________.
A. Fertilization
B. Cleavage
C. Gastrulation
D. Blastula formation
27: If fertilization occurs, the ________ is maintained because the embryo secretes ________.
A. Corpus albicans; human chorionic gonadotrophin
B. Corpus luteum; luteinizing hormone
C. Corpus cavernosum; human chorionic gonadotrophin
D. Corpus luteum; human chorionic gonadotrophin
28: In an operon, the ______ acts as an on/off switch.
A. Operator
B. Regulatory gene
C. Promoter
D. Activator
29: During gastrulation in frogs, a rod of mesoderm under the dorsal surface forms the _____.
A. Blastopore
B. Notochord
C. Ectoderm
D. Spinal cord
30: Between the seventh and the ninth days after fertilization, __________ occurs.
A. Implantation
B. Activation
C. Both a and b
D. None of the above
31: In an operon, the ______ acts as an on/off switch.
A. Operator
B. Regulatory gene
C. Promoter
D. Activator
E. Repressor
32: More people die of ______ cancer than of any other cancer.
A. Lung.
B. Skin.
C. Cervical.
D. Pancreatic.
E. Breast.
33: At the moment of sperm penetration, human eggs _____.
A. Are still surrounded by follicular cells
B. Have a paper-thin cell of calcium carbonate that prevents desiccation
C. Have used flagellar propulsion to move from the ovary to the oviduct
D. Are still located within the ovary
34: Implantation of the blastocyst is the result of all of the following except ________.
A. Adherence of the trophoblast cells to the endometrium
B. Settling of the blastocyst onto the prepared uterine lining
C. Proteolytic enzymes produced by typhoblast cells
D. Phagocytosis by the trophoblast cells
35: The result of polyspermy in humans is ________.
A. Multiple births
B. A nonfunctional zygote
C. Interruption of meiosis
D. Mitotic insufficiency
36: The body of the human embryo develops from the _____ of the blastocyst.
A. Inner cell mass
B. Outer cell mass
C. Neither inner nor outer cell mass
D. None of the above
37: The decidua basalis is ________.
A. Destined to remain in the uterus after the birth of the infant
B. Located between the developing embryo and the myometrium
C. Not a maternal contribution to the placenta
D. The tissue that surrounds the uterine cavity face of the implanted embryo
38: The last major organ system to develop during fetal life is the _____.
A. Heart
B. Lungs
C. Kidneys
D. Veins
39: The radial symmetry of adult echinoderms could best be described as ________.
A. Pentaradial
B. Biradial
C. Triradial
D. Quadriradial
40: Mollusks like clams and snails have a simple heart that pumps _____ through open-ended vessels.
A. 1
B. 3
C. 2
D. 5
41: An earthworm receives support and shape from its fluid-filled cavity. it has _____.
A. Hydroskeleton
B. Pupa Stage
C. Adult
D. Asexual
42: ____ occur over time and slowly deteriorate the organization's capacity to withstand their effects.
A. Rapid onset disasters
B. Trigger
C. Actions after
D. Slow onset disasters
43: During gastrulation in frogs, cells from the animal pole spread over the embryo and form the _____.
A. Ectoderm
B. Notochord
C. Blastopore
D. Backbone
44: If an organism has a relatively large number of hox genes in its genome, it most likely _____.
A. Adaptive radiation
B. Cladistic bias
C. Hard body parts
D. Has a relatively complex anatomy
45: Damage to v1 produces ____ and damage to a1 produces ____.
A. Blindness, deafness to complex sounds
B. Hair cells in the cochlea vibrate, causing ion channels to open in their membrane
C. Mechanical displacement
D. None of this
46: __________ have 46 chromosomes, whereas __________ have 23.
A. Type A spermatogonia; type B spermatogonia
B. Primary spermatocytes; spermatids
C. Spermatogonia; primary spermatocytes
D. Secondary spermatocytes; primary spermatocytes
E. Spermatids; spermatozoa
47: For the frog heart, temperature and heart rate are _______.
A. Vasodilation and sweating
B. Acetylcholine
C. A compensatory pause followed
D. Directly proportional
E. Digitalis and atropine
48: Elongation of bones is accomplished via ____________ growth.
A. Interstitial
B. Stitial
C. Both
D. None
49: Elyse and ellen are fraternal twins. they are the result of _____.
A. One ovum fertilized by one sperm that split into two zygotes
B. Two separate ova that were fertilized by two different sperm
C. One ovum that was fertilized by two sperms
D. Two ova that were fertilized by one sperm
50: Intimacy is the desire for _____.
A. Social connection
B. Generativity
C. Sexual intercourse
D. Self-esteem
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Developmental Biology MCQs
