Four of the five answers listed below provide evidence that genes are located on chromosomes. Select
the exception.
a. the chromosome number is cut in half by meiosis
b. original chromosome number is restored by fertilization
c. some genes tend to be inherited together
d. environmental factors may influence gene expression
e. there are two sets of chromosomes, one maternal and one paternal in diploid forms
D
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Pertussis has been making a big comeback in the last few years, after being on the decline for quite a long time. Why is this?
A. The pertussis vaccine does not seem to protect for a lifetime, so those who received the vaccine as kids may become susceptible in adulthood. B. The strain of Bordetella pertussis that is now the major cause of pertussis is much more virulent than earlier strains. C. People eat so much refined sugars and starches that our immune systems are much weaker, thereby not being able to adequately protect against pertussis bacteria. D. Few people have ever received pertussis vaccines because there have been links to autism.
Which group posses a nucleus?
a. None of these b. Archaea c. Prokaryotes d. Eukaryotes e. Bacteria
Nuclear envelopes reform during _____
a. prophase b. telophase c. interphase d. anaphase e. metaphase
The naive mature B lymphocytes and T lymphocytes develop initially in the bone marrow and thymus respectively. Upon contact with the microbial antigens, these cells differentiate to memory cells among other forms
a. true b. false