Answer the following question given this paragraph: Evidence from the fossil record can be combined with data from molecular clocks. A molecular clock uses DNA sequences (or the proteins they encode) to estimate relatedness among species. Molecular clocks estimate the time in geologic history when related species diverged from a common ancestor. Molecular clocks are based on the assumption that mutations accumulate through time at a steady average rate for a given region of DNA. Species that have accumulated greater differences in their DNA sequences are assumed to have diverged from their common ancestor in the more distant past. Molecular clocks based on different regions of DNA may be used together for more accuracy. Q: Species that have diverged from their common ancestors have greater differences in what? Choices: - life span - cell structure - immunology - dna sequence A:
dna sequence
Answer the following question given this paragraph: Q: What are the antibodies an animal produces after exposure to a microbial antigen? Choices: - isolated - monoclonal - chimeric - polyclonal A:
polyclonal
Q: Answer the following question given this paragraph: Figure 19.24 Coral is the foundation species of coral reef ecosystems. (credit: Jim E. Maragos, USFWS). Q: What is the foundation species of coral reef ecosystems? Choices: - anemones - crystals - molluscs - coral A:
A: coral
Question: Answer the following question given this paragraph: Q: Programmed cell death is also known as? Choices: - suicide - sepsis - necrosis - apoptosis A:
Answer: apoptosis
*Question*
Answer the following question given this paragraph: Human beings and other primates also have the ability to see in color. We have special cells inside our eyes that can distinguish different wavelengths of visible light. Visible light is light in the range of wavelengths that the human eye can sense. The exact wavelength of visible light determines its color. Q: What determines the color of visible light? Choices: - wavelength speed - wavelength density - molecular wavelength - exact wavelength A:
**Answer**
exact wavelength
*Question*
Answer the following question given this paragraph: Eukaryotic cells have other organelles besides the nucleus. The only organelles in a prokaryotic cell are ribosomes. Q: What are the only organelles that prokaryotic cells have? Choices: - nuclei - chloroplasts - fibroblasts - ribosomes A:
**Answer**
ribosomes