A mad scientist decides to start combining embryos and see what develops. He takes cells from the blastula of a frog with blue skin and transplants them into the blastula of a yellow-skinned frog
The embryo receiving the cells develops blue cells in its brain and spinal cord. The scientist must have transplanted the cells into the ________ of the recipient embryo.
A) allantois B) yolk sac C) ectoderm D) mesoderm E) endoderm
C
You might also like to view...
During the 1968 Olympic Games, the International Olympic Committee performed an analysis of ____ on all female athletes in order to verify their sex
a. Barr bodies b. hormone levels c. karyotypes d. genitalia e. phenotypes
Cerebrospinal fluid occupies the space between the:a
dura mater and skull. b. dura mater and pia mater. c. arachnoid and pia mater. d. pia mater and brain. e. dura mater and arachnoid.
A new mutation that arose in one copy of gene X in a somatic cell resulted in the formation of a tumor. Which of the following pieces of evidence best describes how the new mutation directly caused the tumor?
A) Protein X normally stimulates cell division, and the mutation created an overactive version of protein X B) Protein X normally activates a growth hormone receptor, and the mutation decreased the stability of protein X. C) Protein X normally prevents passage through the cell cycle, and the mutation created an overactive version of protein X. D) Protein X normally regulates gene expression, and the mutation created an underactive version of protein X that blocked the cell cycle.
In grouping TV markets into separate types according to regional spending, demographics, and business activity, and cost of advertising is engaging in what sort of analysis?
A. Passive prediction B. Linear regression C. Cluster analysis D. Data mining