Aflatoxins, which are highly toxic, carcinogenic compounds, come from
A) Claviceps purpurea.
B) Aspergillis.
C) corn smut.
D) Candida albicans.
E) Amanita.
B
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Neurons that convey impulses from the CNS to muscles or glands are
A. effectors. B. receptors. C. oligodendrocytes. D. neurotransmitters. E. none of the above.
Hydrogen bonds are found in all of the following EXCEPT
A) between phosphates in ATP. B) in ?-helices. C) between water molecules. D) in the DNA double helix between nucleotides. E) between the R groups of amino acids in proteins.
Which of the following best describes the energy conversion sequence in the solar panel system described in the video?
A- Photons carrying energy from sun chemically react with silicon crystals to generate a flow of electrons. B- Electrons, carrying energy from the sun, are collected by thin chemical wafers, which concentrate the electrons to make electricity. C- Electrons, carrying energy from the sun, are focused by lenses onto wires, which carry the electrons as electricity. D- Photons, carrying energy from the sun, are used to create steam that turns turbines to generate electricity.
How do deletions and translocations in chromosomes often occur?
A) during meiosis I, sister chromatid exchange leads to abnormalities B) chromosomes will break and the sticky ends will rejoin C) chromosomes will fuse telomere to telomere D) when cells undergo meiosis II, chromosomes naturally break when sister chromatids are being pulled apart E) colchicine treatment causes chromosomal rearrangements