What is a scientific theory?
A) an explanation supported by large amounts of experimental evidence
B) an explanation that cannot be modified with new experimental evidence
C) little more than one person's educated guess
D) any testable explanation for a question or problem
A
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Which of the following treatments would enhance the level of the Pfr form of phytochrome?
A) exposure to far-red light B) exposure to red light C) a long dark period D) inhibition of protein synthesis E) synthesis of phosphorylating enzymes
How is active retinal returned to the inactive state?
a. It isn't; rather, the cell degrades the active form and synthesizes new, inactive proteins. b. It is converted back to the inactive confirmation by a series of enzymes. c. It reverts back to the inactive state on its own. d. It is transported to a lysosome. e. The mechanism is not known.
Congenital deafness in humans is due to the homozygous condition of either of the recessive alleles d or e, or both
Both dominant D and E are necessary for normal hearing. Gene D/d affects the middle ear, while gene E/e affects the inner ear. It does not matter how good the normal inner ear (as indicated by E__) is; if there is something wrong in the middle ear, the individual is unable to hear. The same applies for the other gene. Give the phenotypic results of the following crosses: (a) Dd EE x Dd EE (b) Dd Ee x Dd Ee (c) dd EE x DD ee (d) Dd EE x Dd ee (e) Dd EE x DD Ee What will be an ideal response?
In an XY individual, a mutation in an X-linked gene called the androgen receptor results in androgen insensitivity and _____
1.Klinefelter syndrome 2.female phenotype 3.pseudohermaphroditism 4.Turner syndrome 5.X chromosome inactivation