The term ________ means that stem cells retain the capacity to divide, in some cases for the entire life of the organism
Fill in the blank(s) with correct word
self-renewal
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Carbon dioxide (CO2) is
A. returned to the atmosphere during respiration and fermentation. B. used by marine organisms to make limestone for their hard shells. C. removed from the atmosphere during photosynthesis. D. a source of carbon for autotrophs. E. All of the choices are correct.
Which of the following are tiny projections of the mucosal wall?
a. microvilli b. mucins c. villi d. submucosa e. jejunum
Quaking aspen can send out underground stems for asexual reproduction. Sexual reproduction is not as common, but when it does happen, the haploid gametes have 19 chromosomes. How many chromosomes are in the cells of the underground stems?
A) 9 B) 10 C) 19 D) 38
Which of the following statements concerning the Rh factor is CORRECT?
A) The Rh antigen is on white blood cells. B) Eighty-five percent of humans are Rh positive. C) Preexisting antibodies occur in 85% of the population. D) Rh antibodies are more abundant than the ABO antibodies. E) Eighty-five percent of the human population is Rh negative.