Numerous Xenopus cells were exposed to various amounts of ultraviolet light. Some of the resulting cells were observed to lack nucleoli. As a result, one would expect that the cell could not
A) perform cellular respiration.
B) replicate its DNA.
C) perform photosynthesis.
D) synthesize rRNA.
E) none of the above
D) synthesize rRNA.
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Below is a list of molecules with different chemical characteristics
Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the option below that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest). alanine estrogen propanol sodium (a) alanine > propanol > sodium > estrogen (b) sodium > propanol > alanine > estrogen (c) estrogen > propanol > sodium > alanine (d) estrogen > propanol > alanine > sodium
The main organelles and structures involved by distinct function with milk production and secretion in their correct sequence are
A. nucleus, smooth ER, rough ER, nuclear pore, transport vesicle, Golgi apparatus, and vesicle for secretion. B. None of the answer choices is correct. C. nucleus, nuclear pore, rough ER, smooth ER, transport vesicle, Golgi apparatus, and vesicle for secretion. D. nucleus, nuclear pore, Golgi apparatus, rough ER, transport vesicle, smooth ER, and vesicle for secretion. E. nucleus, transport vesicle, rough ER, smooth ER, Golgi aparatus, and vesicle for secretion.
The differential expression of genes depending on parental origin is called ____________________
Fill in the blank(s) with the appropriate word(s).
Which term best describes the symbiotic relationship of well-fed P. bursaria to their zoochlorellae?
A) mutualistic B) parasitic C) predatory D) pathogenic