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1. A 25 year old man visit his doctor to determine the cause of his infertility. Semen analysis results in a diagnosis of azoospermia. You suspect that there may be a _____. a. blockage of the vas deferens. b. spermiogenesis defect. c. loss of dihydrosterone. d. abuse of estrogen. - ANSWER - a. blockage of the vas deferens. or... b. spermiogenesis defect. 2. In studying a genetic form of Hirschsprung's disease due to an EDN3 mutation, you have identified a selecti...

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BIO 351 • BIO 351
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BIO 351 - Exam 2 Fall 2025 Questions With Correct Detailed Answers

1. The image on the right is of a 24-hour old chick embryo. Cells in the epiblast migrate through the structure delineated by the arrows to form the mesoderm and endoderm. What is the name of this structure? a. Somite’s. b. zone of polarizing activity. c. primitive streak. d. anterior visceral endoderm. e. apizal ectodermal ridge. - ANSWER - c. primitive streak 2. Which of the following abnormalities is a severe open neural tube defect caused by a failure of rostral neural tube closur...

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BIO 351 - Exam 1 Fall 2025 Questions And Correct Detailed Answers

1. Which statement is true? a. resact is secreted by mammalian sperm as a chemoattractant. b. the acrosome reaction is necessary for sperm motility. c. bindin is necessary for sea urchin sperm to recognize eggs in a species-specific manner. d. ZP3 is necessary for sea urchin sperm to recognize eggs in a species-specific manner. - ANSWER - c. bindin is necessary for sea urchin sperm to recognize eggs in a species-specific manner. 2. Which of the following statements are INCORRECT? a. dur...

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1. Signaling between endosteal osteoblasts and hematopoietic stem cells (HSCs) in the bone marrow niche are necessary for which of the following? A) Maintenance of HSC potency and proliferation B) Angioblast specification C) Differentiation of myeloid cells only D) Lymphoid cell differentiation only - ANSWER - A) Maintenance of HSC potency and proliferation 2. You have made a trans gene expressing a LacZ reporter gene. Where will this trans gene integrate into the genome? A) At the ...

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BIO 351 - Final Exam Practice Fall 2025 Questions With Correct Detailed Answers

Which of the following is a mechanism underlying the teratogenic defects found in embryos exposed to alcohol? a. Increased neural crest cell proliferation. b. lncreased neural cell adhesion mediated by protein L1. c. lmpaired myoblast migration and differentiation. d. lncreased apoptosis of developing neurons. - ANSWER - d. Increased apoptosis of developing neurons. You have discovered that a pesticide binds to the estrogen receptor, blocking estrogen from binding, and it does not turn o...