Organelles that breakdown hydrogen peroxide into water and oxygen are
A. peroxisomes.
B. liposomes.
C. vacuoles.
D. plastids.
E. lysosomes.
Answer: A
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Target cells are:
a. found only in specific endocrine glands b. endocrine cells c. muscle cells d. always hormone-producing e. equipped with specific receptor molecules and may occur in any part of the body
Which of the following statements concerning a secondary immune response is false?
a. It is a response to an antigen. b. It may occur years after a primary response. c. It involves memory cells. d. It has a longer latent period than a primary response. e. It is stimulated by less antigen than in a primary response.
EGF (epidermal growth factor) activates cell division by binding to ________
Fill in the blank with correct word.
If a pair of homologous chromosomes fails to separate during anaphase of meiosis I, what will be the chromosome number of the four resulting gametes with respect to the normal haploid number (n)?
A) n + 1; n + 1; n - 1; n - 1 B) n + 1; n - 1; n; n C) n + 1; n - 1; n - 1; n - 1 D) n + 1; n + 1; n; n E) n - 1; n - 1; n;n