quiz 7 Questions and Answers
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| At the time the of implantation, the human embryo is called ________. | Blastocyst
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| Which of the following is (are) involved in embryonic development? | All of the answers are correct; cell division, cell differentiation, and morphogenesis
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| Eukaryotic cells control gene expression by which of the following mechanisms? | All of the answers are correct; DNA methylation, histones acetylation, nucleosomes, and enzyme modification of chromatin structure
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| Changes in the shape of the cell usually involves the reorganization of the ________. | Cytoskeleton
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| The embryonic precursor to the human spinal cord is the ______. | Neutral tube
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| For a repressible operon to be transcribed, which of the following must be true? | RNA polymerase must bind to the promoter and the repressor must be inactive
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| Which of the following events is (are) nessicary for the production of a malignant tumor? | Both activation of an oncogene in the cell and the inactivation of tumor-suppressor genes with the cells
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| Transcription of the structural genes in an inducible operon ________. | Starts when the pathway's substrate is present
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| A(n) ________ can inhibit transcription by blocking the binding of positively acting transcription factors to the DNA. | Repressor
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| The outer-to-inner sequence of tissue layers in post-gastrulation vertebrate embryo is _______. | Ectoderm - mesoderm - endoderm
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| Which of the following correctly displays the sequence of developmental milestones? | Cleavage - morula - blastula - gastula
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| Genomic imprinting, DNA methylation,and histone acetylation are all examples of ______. | Epigenetic inheritance
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| In a nucleosome,what is the DNA wrapped around? | Histones
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| The earliest developmental stage among these choices is ________. | Morula
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| The tryptophan operon is a repressible operon that is ________. | Turned off whenever tryptophan is added to the growth medium
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| What is the term for the physical processes that give rise to the shape of an organism? | Morphogenesis
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| As an embryo develops, new cells are produced as a result of ________. | Cell division
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| Animal cells that are present only for a brief developmental phase will, following completion of that phase, undergo _______. | Apotosis
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| From earliest to latest, the overall sequence of early development proceeds in which of the following sequences? | Cleavage - gasturlation - organogenesis
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| A human zygote undergoes its first cell division _______. | 24 hours after fertilization
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| A(n) _______ is a site in the DNA located near the end of the final exon, encoding an RNA sequence that determines the 3’ end of the transcript. | Terminator
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| In mammalian eggs, the receptors for sperm are found in the _______. | Zona pellucid
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| Contact of a sperm with signal molecules in the coat of an eg cause the sperm to undergo _____. | The acrosomal reaction
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| . Uterine implantation due to enzymatic digestion of the endometrium is initiated by the _____. | Trophoblast
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| In humans, identical twins are possible because ________. | The gray crescent divides the dorsal-ventral axis into new cells.
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| To meet a zygote’s metabolic and developmental requirements ___________. | Maternal RNA and maternal proteins must be present.
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| Fertilization normally __________. | reinstates diploidy
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| Cells move to new positions as an embryo establishes its three germ tissue layers during _______. | Gastrulation
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| A(n) _______ binds to a site in the DNA far from the promoter to stimulate transcription. | The longer we live, the more mutations accumulate
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| An open space within the gastrula is the ________. | Archenteron
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| During fertilization, the acrosomal contents _______. | Digest the protective jelly coat on the surface of the egg.
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| Gases are exchanged in the mammalian embryo in the _______. | Chorion
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| The cortical reaction functions directly in the _______. | Formation of a fertilization envelope.
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