Which of the following is true of telomeres?
a. They have the sequence ATAGGG.
b. They are at in the middle of chromosomes.
c. Their sequence can change.
d. They shorten with each round of cell replication.
e. They have the sequence ATAGTG.
ANSWER: d
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The menstrual flow is the result of
a. no implantation of a zygote. b. decreased levels of progesterone. c. discarded uterine lining. d. no implantation of a zygote and discarded uterine lining. e. no implantation of a zygote, decreased levels of progesterone, and discarded uterine lining.
The part of the diencephalon that regulates the body's internal environment is called the ___________
Fill in the blank(s) with the appropriate word(s)
Upon completion of telophase I and cytokinesis, there is(are) ________ cell(s)
A) four haploid B) two diploid C) two haploid D) one diploid
Which of the following statements is NOT correct in context with the NK cells?
A. NK cells cannot kill body cells that lack MHC markers. B. NK cells rec¬ognize certain proteins displayed by body cells that are under stress. C. NK cells can operate early in immune defenses D. NK cells can kill infected or ailing body cells. E. Cytokines secreted by helper T cells stimulate NK cell division