Which of the following statements about reproduction is NOT true?
A. A hermaphrodite produces both male and female gametes in different specialized gonads.
B. Asexual reproduction is most advantageous when the environment is continually changing.
C. A starfish can be cut into several pieces, and each piece will regenerate all the other parts of the individual.
D. Hydras may reproduce asexually by budding new individuals from the parent.
E. Gametes are produced by meiosis and may be specialized as eggs or sperm.
Answer: B
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You decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the semiconservative model of DNA replication is correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?
A. One band of intermediate density. B. One band of intermediate density and one band of light density. C. One band of intermediate density and one band of heavy density. D. One band of heavy density and one band of light density. E. One band of heavy density. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about the Meselson-Stahl experiment? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A negative-stranded RNA virus produces a complete positive-stranded RNA virus that serves as template DNA for other proteins in order to replicate the complete negative-stranded RNA genome
Indicate whether the statement is true or false.
The accompanying figure shows that the rate of alarm calls made by black-tailed prairie dogs is dependent on a perceived threat by a predator. This behavior most closely approximates that predicted by ________
A) mutual benefit B) selfishness C) altruism D) spite
The white blood cells primarily responsible for adaptive immunity are
A) NK lymphocytes and neutrophils. B) B lymphocytes and T lymphocytes. C) macrophages and eosinophils. D) macrophages and neutrophils. E) neutrophils and dendritic cells.