When B cells are activated, some mass-produce antibodies, while others become ________, to protect the body at a later date.
A. memory B cells
B. stationary cells
C. mast cells
D. memory T cells
Answer: A
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Which of the following statements about the 5' end of a polynucleotide strand of RNA is correct?
A) The end has a hydroxyl group attached to the number 5 carbon of ribose. B) The end has a phosphate group attached to the number 5 carbon of ribose. C) The end has phosphate attached to the number 5 carbon of the nitrogenous base. D) The end has a carboxyl group attached to the number 5 carbon of ribose. E) The end is the fifth position on one of the nitrogenous bases.
The formation of _____ depends on gene action, interactions within the embryo, interaction with other embryos that may be in the uterus, and interactions with the maternal environment
Fill in the blank(s) with correct word
Select the best response to the question. ?A person infected with Giardia should be treated with which of the following?
A) antibiotics after the culture and sensitivity report is obtained B) oxygen and inhaled medications C) fluids, electrolytes, and antimicrobials such as metronidazole D) no treatment is currently available
After amplifying one gene of interest using PCR (polymerase chain reaction), you pour your DNA sample into a gel to ensure that the reaction worked. To your surprise, two bands are present on the gel instead of a single band. What is a likely explanation for this outcome?
a. The gene contains a mutation. b. The gene is codominant. c. The DNA sample was derived from a haploid individual. d. Two alleles exist for the gene and they vary in size. The DNA sample was derived from a diploid individual.