4948: Which of the following statements best describes how substances are transported across a membrane against their concentration gradient?Some membrane proteins act as channels for specific molecules to enter the cell. The plasma membrane is permeable to all small molecules. Some membrane proteins are ATP-dependent carrier molecules. The plasma membrane is fully hydrophobic. Even though humans are approximately 99.9 % identical in their genetic makeup, an incredible amount of variation is seen among individuals of the species. This genetic variation is greatly influenced by the process of meiosis.Based on the following events that occur during meiosis, which contributes most to genetic diversity in the human population? Condensation of chromatin during meiosis I Recombination between homologous chromatids during meiosis I Alignment of sister chromatids at the metaphase plate during meiosis II Separation of sister chromatids during meiosis II

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Answered: 4948: Which of the following statements…

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Author:Elaine N. Marieb, Katja N. Hoehn

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Chapter1: The Human Body: An Orientation

Section: Chapter Questions

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4948: Which of the following statements best describes how substances are transported across a membrane against their concentration gradient?

Some membrane proteins act as channels for specific molecules to enter the cell.
The plasma membrane is permeable to all small molecules.
Some membrane proteins are ATP-dependent carrier molecules.
The plasma membrane is fully hydrophobic.
Even though humans are approximately 99.9 % identical in their genetic makeup, an incredible amount of variation is seen among individuals of the species. This genetic variation is greatly influenced by the process of meiosis.

Based on the following events that occur during meiosis, which contributes most to genetic diversity in the human population?
- Condensation of chromatin during meiosis I
- Recombination between homologous chromatids during meiosis I
- Alignment of sister chromatids at the metaphase plate during meiosis II
- Separation of sister chromatids during meiosis II