Homeotic genes generally control
a. X chromosome inactivation.
b. the formation of a specific body part.
c. hormone synthesis.
d. dosage compensation.
e. DNA methylation.
ANSWER: b
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Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that _____
A) gamma contains more DNA than beta B) beta and gamma contain the same amount of DNA C) beta cells reproduce asexually D) beta are in the G0 phase E) beta is a plant cell and gamma is an animal cell
Which of the following statements is NOT true about gamete formation in mammals?
A. In the female, the separation of cytoplasm is unequal during meiosis. B. Only one of the four cells resulting from meiosis goes on to become an oocyte. C. Only one of the four cells resulting from meiosis goes on to become an egg, which becomes a zygote upon fertilization by a sperm cell. D. The polar bodies formed during meiosis in the female can participate in fertilization with sperm. E. The cytoplasm is diminished during development of sperm, and a flagellum is formed to give sperm locomotion.
For the following medical conditions, describe the likely cellular organelle or structure that has been
affected in such a way as to cause the condition (note: There may be more than one organelle or structure involved): A. The sperm of a man cannot swim, thus rendering him infertile. B. A child experiences kidney failure due to Fabry's disease where the cells lining the inside of the kidney tubule accumulate abnormally large amounts of glycolipids that are usually degraded by enzymes. C. A person dies within minutes after ingesting cyanide because ATP is no longer being synthesizedWhat will be an ideal response?
What is the modern definition of a gene?
a. A DNA sequence that encodes a specific RNA or protein product b. A DNA sequence that encodes a specific polypeptide c. An RNA sequence that encodes a single polypeptide d. A DNA sequence that encodes several proteins e. A DNA sequence that encodes specific amino acids