How can we explain the fact that the human genome contains far fewer genes than was predicted would be necessary for our survival?
What will be an ideal response?
Although we currently do not know the complete answer to this question, one partial explanation is that the microorganisms that reside within our bodies help us by synthesizing chemicals, like vitamins, that we then use. This symbiotic relationship may be part of the reason why we have only 20,000 or so genes.
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Which prokaryote is described accurately?
a. A coccus is corkscrew shaped. b. An archaean is arch shaped. c. A bacillus is rod shaped. d. A spirillum is spherical. e. A coccus is flattened.
__________ are short sections of underground stem
encased by overlapping layers of thickened, modified leaves called scales. a. Stolons b. Rhizomes c. Bulbs d. Corms e. Tubers
In humans, the genetic basis for determining the sex "male" is accomplished by the presence of ________
A) high levels of estrogen B) a balance between the number of X chromosomes and the number of haploid sets of autosomes C) a portion of the Y chromosome D) multiple alleles scattered throughout the autosomes E) one X chromosome
Cdks are activated only when they bind to
A) centrioles. B) cytosine. C) cyclin. D) chromatids.