How many replication forks depart from an origin of replication?
A) one
B) two
C) three
D) four
B) two
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What is the first step of the adaptive immune response?
a. Recruitment of helper T cells b. Inflammation c. Mast cells attacking the antigen d. Fever e. Recognizing a specific antigen
It is beneficial to study microbial communities in situ because ________.
A. microbes can be studied even if they are nonculturable B. gene expression may be different in an environmental sample versus an anexic culture C. in situ studies maintain the relative concentrations of different microorganisms in a sample D. All of these are reasons to study microbial communities in situ.
Which of the following is NOT a possible function of magnetosomes?
A) Get cells to the North Pole B) Protect cells from hydrogen peroxide accumulation C) Store iron D) Locate suitable environments
In Drosophila, a cross between M males and P females is fertile because
a. P elements are inherited maternally. b. males produce a repressor protein. c. P elements are not expressed in females. d. egg cytoplasm contains a protein that suppresses transposition. e. P elements are nonautonomous.