Sea cucumbers and sedentary annelid worms share all but which in common?
a. both can be deposit feeders.
b. both have oral structures to collect detritus.
c. similar body segmentation.
d. digestive tract is a straight tube
C
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Many scientists and drug companies have worked hard to produce drugs to stop various stages of the HIV life cycle. Some drugs have been tested that inhibit the function of Vpu. What stage of the HIV life cycle would such a drug inhibit?
A. Synthesis of double stranded DNA B. Virus assembly C. Virus budding D. Integration into the host chromosome
The agouti gene, when expressed in mice, makes them obese, ravenous, yellow, and prone to diabetes. The agouti phenotype is dominant. During ovulation an agouti mouse is given a drug that methylates (or shuts off the agouti gene). She is then bred to another mouse and gives birth to a litter of baby mice, none of whom have the agouti phenotype. Which of the following is accurate?
A. An epigenetic change in the mother was passed to her offspring. B. Her offspring inherited the methylated form of the agouti gene. C. The agouti gene will be inactivated for the entire lives of her offspring. D. All of these are correct.
Of the following carbon reservoirs, which contains the lowest mass of carbon?
a. atmosphere b. oceans c. sedimentary rock d. soil
The surgical removal of the seminal vesicles would likely _____
A) cause sterility because sperm would not be produced B) cause sterility because sperm would not be able to exit the body C) greatly reduce the volume of semen D) cause the testes to migrate back into the abdominal cavity