Unlike dna, rna a. contains nitrogenous bases. b. pairs uracil with adenosine instead of thymine. c. has deoxyribose as the sugar within its nucleotide components. d. contains two strands wrapped in a helix.

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In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled