{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

2011 Practice Exam Ia

2011 Practice Exam Ia - UNIT I PRACTICE EXAM 1a BSC 2011...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
UNIT I PRACTICE EXAM 1a BSC 2011 Before you begin: Use only #2 pencil and please write your name and social security number on the computerized score sheet. Fill in the corresponding bubbles under these. Fill in the Form (A or B), instructor (Spears), course (BSC 2011), and section (01) lines. Select the best answer to each question and carefully fill in your response. Please avoid making any stray marks on the answer sheet. ONLY ANSWERS RECORDED ON THE COMPUTERIZED SCORE SHEET WILL BE GRADED. 1) Which of the following is not true of cell communication systems? A) Most signal receptors are bound to the outer membrane enclosing the nucleus. B) Signaling mechanisms occur in eukaryotic cells, but not in prokaryotic cells. C) Communicating cells may be far apart or close together. D) Phosphorylation cascades are a major mechanism of signal transduction. E) In response to a signal, the cell may alter activities by changes in transcription of RNA. 2) Which of the following serve as sources of developmental information? A) cytoplasmic determinants such as mRNAs and proteins produced before fertilization B) signal molecules produced by neighboring cells C) ubiquitous enzymes such as DNA polymerase and DNA ligase D) A and B only E) A, B, and C 3) The primitive streak in a chick or human embryo is the functional equivalent of ______. A) neural crest cells in a mammal. B) the notochord in a mammal. C) the archenteron in a frog. D) the lip of the blastopore in the frog. E) polar bodies in a sea urchin. 4) Without the formulation of an ectoderm, vertebrates would not form _______. A) pancreas. B) a liver. C) kidneys. D) heart. E) a nervous system. 5) What is the process called that involves the movement of cells into new relative positions in an embryo and results in the establishment of three germ tissue layers? A) gastrulation B) determination C) neurulation D) induction E) cleavage 6) Which one of the following plays a major role in gas exchange in a chick embryo? A) trophoblast B) hypoblast C) amnion D) yolk sac E) chorion 7) Muscle is derived from _______. A. ectoderm B. endoderm C. mesoderm
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
8) Which of the following is least related to the others? A) germ layers B) gastrulation C) invagination D) blastopore E) morula 9) Which of the following is true about the slow block to polyspermy in sea urchins? A. It can be reversed if a fertilization envelope fails to develop B. It is induced by a depolarization, or change in membrane potential, of the egg C. It provides a permanent block D. It is induced when acrosomal enzymes digest a path through the jelly coat E. It is slow to develop but lasts for only a minute 10) Which developmental sequence is correct ? A) gastrula, morula, blastula, cleavage B) morula, cleavage, gastrula, blastula C) cleavage, blastula, gastrula, morula D) cleavage, morula, blastula, gastrula E) cleavage, gastrula, morula, blastula 11) As cleavage continues during frog development, the number of cells in a blastula _____. A) increases as the size of the cells decreases.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 7

2011 Practice Exam Ia - UNIT I PRACTICE EXAM 1a BSC 2011...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon bookmark
Ask a homework question - tutors are online