What is the purpose of the "control" in a controlled experiment?
What will be an ideal response?
The control will have only one variable compared to the treatment group. The control group provides a basis for comparison.
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Genetic material, DNA and RNA, are found in three distinct organelles in eukaryotic cells, what are these organelles and which type of relationship may have lead to their formation?
A. Chloroplast, mitochondria, nucleus, endosymbiotic. B. Chloroplast, lysosomes, nucleus, endosymbiotic. C. Nucleus, Golgi body, endoplasmic reticulum, symbiotic. D. Mitochondria, chloroplast, nucleus, parasitic. E. Lysosomes, mitochondria, chloroplast, parasitic.
Which of the following is most logical from a
health perspective? a. Light skin and little exposure to sun. b. Light skin and extensive exposure to sun. c. Dark skin and little exposure to sun. d. Dark skin and lots of exposure to sun. e. Light skin and little sun, or dark skin and lots of sun
In a missense mutation:A
All the amino acids beyond the mutation point are changed. B. A nucleotide is added to the DNA. C. A nucleotide is deleted from the DNA. D. A single amino acid is altered. E. The protein is always completely nonfunctional.
The predatory bacterium Bdellovibrio bacteriophorus drills into a prey bacterium and, once inside, digests it. In an attack upon a Gram-negative bacterium that has a slimy cell covering,
what is the correct sequence of structures penetrated by B. bacteriophorus on its way to the prey's cytoplasm? 1. membrane composed mostly of lipopolysaccharide 2. membrane composed mostly of phospholipids 3. peptidoglycan 4. capsule A) 2, 4, 3, 1 B) 1, 3, 4, 2 C) 1, 4, 3, 2 D) 4, 1, 3, 2