What is the function of the yolk sac in human development?
1.It is a lining of the placenta.
2.It is the source of the urinary bladder for the placenta.
3.It becomes the site of red blood cell formation.
4.It encloses and protects the embryo in a fluid-filled cavity.
3
You might also like to view...
If fertilization involves two gametes that contain different alleles of a given gene, the resulting offspring is
A. dihybrid. B. haploid. C. heterozygous. D. homozygous. E. polygenic.
The molecule directly responsible for breaking down cAMP to inactive AMP is
A. phosphodiesterase. B. protein kinase A. C. protein phosphatase. D. adenylyl cyclase. E. GTPase.
Which of the following statements regarding vectors is FALSE?
A. Vectors are usually autonomously replicating DNA molecules. B. A useful vector contains multiple restriction sites for insertion of DNA. C. Vectors are generally over 100,000 base pairs in size. D. Cloning vectors frequently contain sequences necessary for expression of inserted sequences. E. Cloning vectors include a "marker" to facilitate identification of cells containing them.
The ________ is the entire interwoven mass of one multicellular fungal organism.
A. hyphae B. sporangium C. mycelium D. pseudoplasmodium E. conidiophore