Compare the worldwide distribution of seabirds to that of marine reptiles. Which is more widely distributed at all latitudes? Why do you think this is so?
What will be an ideal response?
Seabirds are definitely more widely distributed than any of the marine reptiles. Seabirds can be found in arctic and Antarctic regions and everywhere in between. Marine reptiles, on the other hand, are limited to the warm temperatures of tropical and subtropical waters. The main reason for these different distributions is the fact that reptiles are poikilothermic and are limited to warm areas for metabolic reasons. Birds are homeothermic, which means they can regulate their internal body temperatures.
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__________ immunity specifically targets billions of different antigens. Fill in the blank(s) with the appropriate word(s)
In knockout experiments,
a. genes are removed from chromosomes. b. normal genes are replaced physically by mutated genes. c. wild type genes are mutated to prevent their transcription or translation. d. mRNAs are prevented from attaching to ribosomes. e. the protein products of specific genes are inactivated.
Following S phase, a human cell would have how many pairs of sister chromatids and individual DNA molecules?
A. 23 pairs of sister chromatids and 92 individual DNA molecules B. 46 pairs of sister chromatids and 46 individual DNA molecules C. 46 pairs of sister chromatids and 184 individual DNA molecules D. 46 pairs of sister chromatids and 92 individual DNA molecules E. 23 pairs of sister chromatids and 46 individual DNA molecules
Sponges are radially symmetrical
Indicate whether the statement is true or false