With sexual reproduction, two genes for the same trait that are slightly different are called __________. Fill in the blank(s) with the appropriate word(s)
ANSWER: alleles
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Scientists using RNA in situ hybridization techniques observed that a transcription factor called macho-1 localized to some cells during early cleavage, but not others. Descendents of the cells expressing macho-1 produced mesoderm
If you prevented the expression of macho-1 in an embryo during cleavage, which structures would be most likely be absent in later development? A) neural tube B) somites C) digestive system D) skin
A common consequence of nutrient deficiencies in plants is chlorosis, which is
a. wilting due to a lack of chlorine in leaves. b. death of the growing tips. c. premature loss of leaves. d. bursting of cells from excess water uptake due to an inability to clear chlorine from them. e. yellowing of plant tissues due to a lack of chlorophyll.
The process of ________ occurs when molecules move down a concentration gradient due to random molecular motion
Fill in the blank(s) with the appropriate word(s).
Circulatory systems have the primary benefit of overcoming the shortcomings of
A) temperature differences between the lungs and the active tissue. B) the slow rate at which diffusion occurs across cells. C) communication systems involving only the nervous system. D) having to cushion animals from trauma. E) fetal organisms maintaining an optimal body temperature.