Q: Q: What is the name of the portion of a nucleotide lacking phosphate groups? Read this paragraph and choose the correct option from the provided answers: Choices: - nuclear shell - a nucleobase - nucleolus - a nucleoside A:
A: a nucleoside

Q: Q: Human population is growing exponentially and humans have increased what normally limiting factor through technology, urbanization, and harnessing the energy of fossil fuels? Read this paragraph and choose the correct option from the provided answers: 19.3 The Human Population Earth's human population is growing exponentially. Humans have increased their carrying capacity through technology, urbanization, and harnessing the energy of fossil fuels. The age structure of a population allows us to predict population growth. Unchecked human population growth could have dire long-term effects on human welfare and Earth's ecosystems. Choices: - zero population growth - mass extinction - habitat loss - carrying capacity A:
A: carrying capacity

Q: Q: What is the first and longest phase of mitosis known as? Read this paragraph and choose the correct option from the provided answers: Prophase is the first and longest phase of mitosis, see Figure below . During prophase, the chromatin (DNA) coils up into visible chromosomes, each made up of two sister chromatids held together by the centromere. Also during this phase, the nucleolus disappears, and the spindle begins to form from the centrioles. Most eukaryotic cells contain structures known as centrosomes, consisting of a pair of centrioles. During prophase, the centrioles begin to move to opposite ends, or poles, of the cell. As the centrioles migrate, the fiber-like spindle begins to elongate between the centrioles. The spindle is a thin, cage-like structure made out of microtubules. In plant cells, the spindle forms without centrioles. The spindle plays an essential role moving chromosomes and in the separation of sister chromatids. Choices: - metaphase - telophase - anaphase - prophase A:
A: prophase

Q: Q: Darwin found that, since all species are related to each other and some of them evolve together, so they develop similar what? Read this paragraph and choose the correct option from the provided answers: It's rare for a biologist to predict the discovery of a new species. For his prediction, Kavanaugh drew inspiration from Darwin's own 1862 prediction. When Darwin observed an orchid from Madagascar with a foot-long nectar, he predicted that a pollinator would be found with a tongue long enough to reach the nectar inside the orchid's very thin, elongated nectar ''pouch'', though he had never seen such a bird or insect. Darwin's prediction was based on his finding that all species are related to each other and that some of them evolve together, developing similar adaptations . Darwin's prediction came true in 1903, when a moth was discovered in Madagascar with a long, thin proboscis, which it uncurls to reach the nectar in the orchid's nectar. In the process of feeding from the orchid, the moth serves as its pollinator. The moth was given the scientific name Xanthopan morganii praedicta , in honor of Darwin's prediction. Choices: - appearance - language - systems - adaptations A:
A: adaptations