Phages are being considered for:a
vectors in gene therapy experiments.
b. antibiotics in bacterial infections.
c. gene transfer vectors in animal cells.
d. being equivalent to the first living organisms.
e. All of the above
B
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What structures of the male and female reproductive systems do not share a common embryonic origin?
A. labia majora and scrotum B. labia minora and urethra C. clitoris and penis D. cervix and ejaculatory duct E. All of these pairs share a common embryonic origin.
The endosperm of a plant
a. is the food supply for the new sporophyte plant. b. is composed of haploid tissue. c. protects the young embryo within a seed. d. provides a connection between the ovary of a flower and a developing seed. e. produces sperm cells
Blood calcium levels will increase under the influence of ________, and decreases under the influence of ______.
Fill in the blank(s) with the appropriate word(s).
Which hormone affects the greatest variety of cell types?
A) parathyroid hormone B) melatonin C) growth hormone D) calcitonin