In an experiment with amphibian embryos, cells from a blastomere that was divided in two developed normally under which condition?
A. When they contained at least half of the gray crescent
B. Only when cells did not have the gray crescent
C. Only when cells received the full amount of gray crescent
D. When cells were cleaved bilaterally
E. When cells were cleaved radially
Answer: A
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Control of gene expression
_____ allows bacteria to adapt to changing environments. _____ is critical for development in multicellular organisms. _____ allows bacteria to replicate without control. _____ allows multicellular organisms to maintain homeostasis. _____ it stops multicellular organisms functioning as a whole.
The process of evaluating the quality of information before accepting it is called ________
a. critical thinking b. the scientific method c. deductive reasoning d. inductive reasoning e. making a prediction
Cholesterol is a ________, which ________
A) terpene; is the basis for many animal and plant vitamins B) fatty acid; functions in energy storage C) steroid; is a component of eukaryotic membranes D) steroid; is the basis for many animal and plant hormones E) steroid; is a component of eukaryotic membranes and is the basis for many animal and plant hormones
Which of the following is not true about the G + C content percentages in DNA of organisms?
A. Organisms with similar G + C percentages have similar base sequences. B. Similar G + C percentages only suggests relatedness if the two organisms are also alike phenotypically. C. Organisms with different G + C percentages have dissimilar base sequences. D. All of the choices are correct.