A chemical compound which specifically disrupts the 9+2 microtubule arrangement would be a potential drug candidate as a(n)
A) herbicide (weed-killer).
B) contraceptive drug disabling motility of human sperm.
C) drug targeting fungal pathogens.
D) antibiotic targeting motile bacteria.
E) antimicrobial targeting amoeboid protozoans.
Answer: B
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Investigators performed nuclear transplant experiments to determine whether DNA is altered irreversibly during development. Which of the following statements about these experiments is true?
(a) Because the donor nucleus is taken from an adult animal, the chromosomes from the nucleus must undergo recombination with the DNA in the egg for successful development to occur. (b) The embryo that develops from the nuclear transplant experiment is genetically identical to the donor of the nucleus. (c) The meiotic spindle of the egg must interact with the chromosomes of the injected nuclei for successful nuclear transplantation to occur. (d) Although nuclear transplantation has been successful in producing embryos in some mammals with the use of foster mothers, evidence of DNA alterations during differentiation has not been obtained for plants.
Using the data in the figure above, how long does it take for virus B to go through one lytic cycle?
A) 15 minutes B) 30 minutes C) 45 minutes D) 60 minutes
What type of thinking is required?
What will be an ideal response?
Which of the following has the shortest axons?
a. interneurons b. motor neurons c. sensory neurons d. the brain stem