The failure of chromosomes to separate during mitosis or meiosis is called
a. genetic displacement.
b. trisomy.
c. crossing over.
d. nondisjunction.
e. disjunction.
ANSWER: d
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Moist heat sterilization at 100°C kills all of the following EXCEPT
A. bacterial endospores and fungal spores. B. viruses. C. bacterial endospores. D. fungal spores.
Answer the following statements true (T) or false (F)
1. Technically speaking, all antibodies are immunoglobulins, but not all immunoglobulins are antibodies. 2. IgG is the largest of the five classes of immunoglobulins. 3. The primary function of NK and K cells is to kill foreign cells, virus-infected cells, and tumor cells. 4. Common allergic reactions, such as those experienced in hayfever, are also known as anaphylactic reactions. 5. IgM antibodies and basophils play major roles in anaphylactic reactions.
Which secreted molecule is LEAST likely to effect a significant change in blood pressure?
A. antidiuretic hormone B. aldosterone C. nitric oxide D. high-density lipoprotein E. atrial natriuretic hormone
Chloroplasts and mitochondria are similar in that they both
A) are involved in cellular waste processing B) are involved in protein production for the cell C) are involved in helping to maintain cell shape D) contain DNA E) are membranous sacs involved in storage