The extraembryonic membrane that is the first site of blood cell formation in mammals is the _____________

Fill in the blank(s) with the appropriate word(s)


Answer: yoke sac

Biology & Microbiology

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E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged

What density distribution of DNA would you expect in this experiment? A) one high-density and one low-density band B) one intermediate-density band C) one high-density and one intermediate-density band D) one low-density and one intermediate-density band E) one low-density band

Biology & Microbiology

Which of the following forces contribute to the stability of a DNA double helix?

A. hydrophobic interactions of bases in the same strand B. hydrogen bonding between bases in adjacent strands C. ionic interactions between the positively charged component of one base and the negatively charged component of the neighboring base D. hydrophobic interactions of bases in the same strand and hydrogen bonding between bases in adjacent strands E. hydrophobic interactions of bases in the same strand, hydrogen bonding between bases in adjacent strandsand ionic interactions between the positively charged component of one base and the negatively charged component of the neighboring base

Biology & Microbiology

All blood cells originate from the

A. erythrocyte. B. leukocytic stem cell. C. eosinophilic stem cell. D. hematopoietic stem cell.

Biology & Microbiology

Which of the following statements is contrary to the first law of thermodynamics?

a. When gasoline is burned, its energy is destroyed. b. Energy can be transferred from one form to another. c. Energy can be converted from one form to another. d. Matter can be converted into energy. e. The amount of energy in the universe is constant.

Biology & Microbiology