The placenta
A) is where blood cells form before the fetus has bone marrow.
B) nourishes the fetus and secretes hormones that maintain the pregnancy.
C) is a membrane surrounding the embryo that gives rise to the blood vessels in the umbilical cord.
D) is the membrane that contains the fetus.
B) nourishes the fetus and secretes hormones that maintain the pregnancy.
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The figure above represents
a. a chromosome in the G1 phase of interphase. b. two chromosomes in metaphase plate. c. an original chromosome with a duplicate. d. the entire genome of the organism. e. none of these.
A(n) ____________________ is a large-scale community of organisms in a major ecological setting. Fill in the blank(s) with the appropriate word(s)
When comparing the 5th and the 6th edition pie graphs of U.S. consumption of energy by source, which source(s) of energy has decreased in the 2019 edition?
A. Renewables B. Nuclear C. Fossil fuels D. Wind E. All of the above have decreased in the new edition
Which of the following is common to both factor-dependent and factor-independent transcription termination?
A. Both types of termination are associated with rho termination factor. B. Both types of termination involve NusA protein. C. Both types of termination occur following a pause by the polymerase. D. None of the choices are correct.