During the stage called neurulation, a flexible rod called a ________ forms along the midline of the dorsal surface of the embryo.
A. neural groove
B. notochord
C. somite
D. dorsal nerve cord
Answer: B
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When does DNA replication take place regarding meiosis? DNA replication _____
A) does not take place in cells destined to undergo meiosis B) occurs before meiosis I begins C) occurs between meiosis I and meiosis II D) occurs during prophase I
Which of the following best describes the type of bacteria found in your guts?
a They are less similar to that of your family than to people unrelated to you, and are not unique to you. b. They are less similar to that of your family than to people unrelated to you, but are still unique to you. c. They are more similar to that of your family than to people unrelated to you, and are not unique to you. d. They are more similar to that of your family than to people unrelated to you, but are still unique to you.
Normal genes have a promoter followed by a start codon. In a mutant gene, the "A" in the start codon has been deleted. Which of the following is not a possible outcome?
A) The normal protein will be produced. B) A shorter protein will be produced. C) A longer protein will be produced. D) No protein will be produced.
Organisms that live at very low temperature the generally referred to as
A. Halophiles B. Thermophiles C. Mesophiles D. Psychrophiles