When the levels of estrogen in the blood are low, estrogen acts as a _______ regulator.
Fill in the blank(s) with correct word
Answer: Negative Feedback
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Cloning of plants from cuttings demonstrates that _____
A) an individual plant cell cannot de-differentiate and then redifferentiate B) differentiated plant cells may contain embryonic mRNAs C) plants lose genetic information in the differentiation process D) mature plant cells retain the full genetic information needed to carry out the developmental processes to produce a new individual plant
Which of the following contain both chlorophyll a and chlorophyll b?
A. Green sulfur bacteria B. Cyanobacteria C. Purple sulfur bacteria D. Prochloron
Which of the following statements could explain why BC homozygous birds are unusually small?
Black-cheeked BC zebra finches are extremely desirable, but relatively rare. This phenotype is caused by a recessive mutation, but the mating of two BC birds is considered unethical because it results in very small birds. Therefore, BC birds are created by crossing carriers of the BC gene. Despite problems with the homozygous recessive, some unscrupulous breeders continue to breed them together because of the high prices they fetch. A. The BC gene causes a mutation in a growth gene. B. The BC gene and a gene for growth are very close to one another on the same chromosome. C. The BC gene and a gene for growth are both mutated. D. The dominant version of the cheek color gene (GC) encodes a gene for normal size. E. The BC gene and growth gene are close together on the same chromosome and/or both of these genes are mutated.
The E. coli that normally live in the human large intestines and produce vitamin K that the body uses would be best termed a ________ relationship.
A. saprobic B. parasitic C. commensal D. mutualistic