Immature B lymphocytes undergo clonal deletion in the bone marrow
Indicate whether the statement is true or false
TRUE
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The scientific work that established DNA, rather than protein, as the molecule of heredity is credited to
A) Monod and Jacob. B) Watson and Crick. C) Avery, MacLeod, and McCarty. D) Beadle and Tatum. E) Correns, von Tschermak, and de Vries.
The snakes include some rather short and some incredibly long species, with a variation from about 100 to over 300 vertebrae. What developmental mechanism is the best candidate for changing the number of vertebrae in evolution?
A. Changes in genes that lay down extracellular matrix in bone B. Changes in genes necessary for neural crest development C. Changes in genes that control mitosis D. Changes in the somitogenesis clock Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about the development of vertebrae? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Which one of the following statements about gender determination is TRUE?
A) The male gender is determined by the presence of only one X chromosome. B) The male gender is determined by the presence of a Y chromosome. C) The hormones estrogen and progesterone are key players in the development of internal and external female genitalia. D) The development of male genitalia is the "default" condition in the absence of estrogen. E) The development of female genitalia is activated by the presence of anti-Mullerian hormone.
Millions of years ago, the activity of which cellular organelle would have been dependent upon the presence of
cyanobacteria? a. Golgi b. nucleus c. ribosome d. mitochondrion e. endoplasmic reticulum