Koopman’s research on mouse meiosis revealed ____
a. a meiosis promoting gene
b. a meiosis inhibiting gene promotes retinoic acid production
c. that retinoic acid prevents meiosis
d. Cyp26b1 gene expression in embryonic testes but not ovaries
e. germ cells form later in male mice that lack the Cyp25b1 gene
ANSWER: d
You might also like to view...
The rate of diffusion of molecules would be fastest in a cell with an
A. internal concentration of 45 percent and an external concentration of 50 percent in cold temperatures. B. internal concentration of 50 percent and an external concentration of 12 percent in cold temperatures. C. internal concentration of 50 percent and an external concentration of 12 percent in warm temperatures. D. internal concentration of 40 percent and an external concentration of 35 percent in warm temperatures. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about factors that affect the rate of diffusion? What other information is related to the question? 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?
List the four major characteristics of chordates.
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. One common feature with G-protein coupled, enzyme-linked, and growth factor receptors is that their activation leads to activation of protein kinases. 2. Cyclic AMP activates protein kinase C in producing a cell response. 3. If IP3 binds a Ca2+ ligand-gated ion channel in the endoplasmic reticulum, then cytosolic Ca2+ levels will rise in the cell. 4. If epinephrine increases glycogen metabolism in muscle cells, it would have the same function in brain cells.
The process of morphogenesis in development begins ________ after fertilization
A) 3 weeks B) 20 weeks C) 12 weeks D) immediately