Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?
A) 4 per milliliter
B) 9 per milliliter
C) 18 per milliliter
D) 36 per milliliter
E) 72 per milliliter
D
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The Ti plasmid is used to ____
a. create clones of mammals b. treat human diseases by somatic gene therapy c. insert transgenes into bacteria d. insert transgenes into plants e. insert transgenes into animals
Vaccines can contain all of the following EXCEPT
a. a killed pathogen. b. a weakened pathogen. c. noninfective fragments of a pathogen. d. an unmodified antigen. e. inactivated bacterial toxins.
What filters out waste and is similar to our kidneys and helps the worm get rid of waste?
A. pores B. kidneys C. nephridia D. clitellum
Answer the following questions true (T) or false (F)
1. Cleavage includes the stage of development between the zygote and blastula. 2. The blastula is the stage of embryonic development in which cells migrate. 3. Gastrulation begins at the sea urchin blastula's vegetal pole.