2011 Unit I Practice Exam 1e

2011 Unit I Practice Exam 1e - BSC 2011 UNIT I Practice...

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BSC 2011 UNIT I Practice Exam 1e DIRECTIONS: Please bubble in the letter of the single best choice on your scantron. 1. The majority of genes in an organism’s genome code for _____. A) tRNA molecules B) proteins C) carbohydrates D) rRNA E) none of these 2. The “genetic information” contained within a gene resides in its ______. A) sequence of amino acids B) sugar-phosphate chain C) sequence of ribonucleotide bases D) double helix E) sequence of deoxyribonucleotide bases 3. In a sea urchin, the end result of the cleavage stage of embryonic development is _______. A) a gastrula B) a neurula C) a morula D) an archenteron E) a blastula 4. What can be said of methylated regions of DNA? A) genes in these regions are being expressed B) genes in these region are being transcribed C) genes in these region are being translated D) genes in these regions are inactivated E) both choices A and B 5. Laboratory tissue-culture techniques are used to make several clones from a parental carrot plant. Clones that grown in low-light conditions produce broad leaves, whereas clones that are grown in bright light produce much narrower leaves. This is an example of _____. A) maternal determination B) polyphenism C) differential genomic equivalence D) morphogenic regulation E) genetic induction 6. Which of the following is an example of a maternal cytoplasmic determinant? A) Drosophila bicoid mRNA B) tadpole thryroxin C) ectodermal N-cadherin D) mesodermal N-cadherin E) none of the above 7. What occurs at a ribosome? A) transcription of mRNA B) replication of mRNA C) translation of tRNA D) transcription of DNA E) translation of mRNA 8. Which process below is NOT involved in cell differentiation? A) induction B) cell signaling C) determination D) gene regulation E) DNA replication 9. How does an adult stem cell (ASC) differ from an embryonic stem cell (ESC)? A) There is no such thing as an “adult” stem cell. B) Some genes are irreversibly turned off in an ASC, but not in an ESC. C) An ASC is totipotent; an ESC is pluripotent. D) An ASC doesn’t respond to inductive signals, whereas an ESC still does. E) none of the above 10. Differentiated cell types first appear during _______. A) organogenesis B) cleavage C) neurulation D) blastulation E) gastrulation 11. The blastopore opening is formed in a sea urchin embryo by _______.
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A) cleavage of cells at the animal pole B) involution of primary mesenchyme cells C) invagination of surface cells at the vegetal pole D) involution of the zygote cell membrane E) ingression of primary mesenchyme cells 12. Humans belong to the ____ lineage of animals that exhibit _____ embryonic cleavage. A) deuterostome; spiral B) protostome; spiral C) protostome; determinate D) protostome; radial E) deuterostome; radial 13. Which is the correct sequence of events leading to the fast block to polyspermy during sea-urchin fertilization? A) calcium wave - cortical reaction – fertilzation envelope
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This document was uploaded on 11/03/2011 for the course BIO bsc2011 at FSU.

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2011 Unit I Practice Exam 1e - BSC 2011 UNIT I Practice...

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