Which of the following historical figures came up
with the idea of the periodic table?
a. Demitri Medeleev
b. Niels Bohr
c. Louis Pateur
d. Robert Koch
e. None of these
Answer: a
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What is a consequence of long term exposure to carbon monoxide from environmental tobacco smoke for infants and children
True or false: The loop of Henle represents a countercurrent exchanger because it creates a concentration gradient rather than simply maintaining it
A. true B. false
Many animals share homologues of the gene PAX6, which is important in the development of ________
a. legs b. eyes c. segmentation d. wings
Investigators performed nuclear transplant experiments to determine whether DNA is altered irreversibly during development. Which of the following statements about these experiments is true?
(a) Because the donor nucleus is taken from an adult animal, the chromosomes from the nucleus must undergo recombination with the DNA in the egg for successful development to occur. (b) The embryo that develops from the nuclear transplant experiment is genetically identical to the donor of the nucleus. (c) The meiotic spindle of the egg must interact with the chromosomes of the injected nuclei for successful nuclear transplantation to occur. (d) Although nuclear transplantation has been successful in producing embryos in some mammals with the use of foster mothers, evidence of DNA alterations during differentiation has not been obtained for plants.