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Some examples from this set of practice questions
1.
For which DNA repair mechanism is the sister chromatid used as a template? A. Non-homologous end-joining G1 to S B. Homologous end-joining S to G2 C. Mismatch repair D. Direct reversal
Answer: B. Homologous end joining S to G2
2.
2. Correct sequence of cell stages in spermatogenesis A. Spermatocytes- spermatids- spermatognia- spermatozoa B. Spermatogonia- spermatids- sprmatocytes- spermatozoa C. Spermatogonia - spermatocytes- spermatids- spermatozoa D. Spermatocytes- spermatogona- spermatids- spermatozoa
Answer: C. Spermatogonia - spermatocytes- spermatids- spermatozoa
3.
3. A mutational event, in which adenine is replaced by guanine, is called A. Transition B. Transcription C. Transversion D. Frame shift mutation
Answer: A. Transition
4.
4. Where does meiosis halt in oogenesis? A. Metaphase 1 B. Prophase 2 C. Metaphase 2 D. Anaphase 1
Answer: C. Metaphase 2
5.
5. Choose three processes that occur in meiosis that do not occur in mitosis. - haploid cells produced - chiasmata formation - crossing over - homologous pairs associate and line up - two phases/divisions
Answer: - haploid cells produced - crossing over - two phases/divisions
6.
Which of the embryonal stages below is the last stage where all cells are totipotent? A. Zygote B. Blastocyst C. 8-cell D. 16-cell
Answer: D. 16-cell (-> morula) The blastocyst is already totipotent
7.
2. What is the name of the glycoprotein receptor that the sperm binds to on the zona pellucida? A. ZP1 B. ZP2 C. ZP3
Answer: C. ZP3
8.
3. What step comes first in IVF? A. Egg and sperm combine. B. Stimulate ovulatory process. C. Place in culture for 2 - 6 days. D. Remove ovum.
Answer: B. Stimulate ovulatory process.
9.
4. A wave of which molecule causes the release of the content of the cortical granules? A. Na+ B. Ca2+ C. K+ D. Cl-
Answer: B. Ca2+
10.
5. Which protein aids in the accumulation of blastocoelic fluid?
Answer: Na+/K+ ATPase
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