__________ used x-ray diffraction to provide images of DNA
a. Watson and Crick
b. Crick and Wilkins
c. Franklin
d. Franklin and Crick
e. Watson and Wilkins
C
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Both root hairs and mycorrhizae _________. (Select all correct answer options.)
A. increase the surface area for nutrient uptake B. consume carbohydrates C. increase the volume of soil accessible to the plant D. enhance the binding of the roots to the soil
Epidermal growth factor is a mitogen, because it stimulates cells to divide
(1) Explain the role of Ras in epidermal growth factor signaling that results in cell division. (2) Design two experiments to prove that Ras is a key player in the EGF-activated pathway. (3) What assay other than cell division could you use to assess whether the EGF-Ras-MAPK pathway has been activated? What will be an ideal response?
In evaluating the credibility of a null hypothesis, it is standard to construct a single value derived from the sample which is known as the:
A. random sample. B. sample standard deviation. C. alternative hypothesis. D. test statistic.
When does an oocyte complete meiosis II?
A) after fertilization B) immediately after birth C) immediately after release from the ovary D) as soon as puberty begins E) in the seventh month of fetal life