Foreign materials are filtered out of the lymphatic fluid by what type of cell located within the lymph nodes?
A) platelets
B) leukocytes
C) macrophages
D) mast cells
E) erythrocytes
Ans: C) macrophages
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Given that fertility rate is defined as each woman producing exactly enough offspring to replace herself and her offspring's father, if the fertility rate is sustained for a generation, then _____
A) r = 0 and there is zero population growth B) 0 < r < 1 C) r = 1 D) r > 1 E) population size is at carrying capacity
The positively charged particles in the nucleus of an atom are called ________
a. photons b. electrons c. neutrons d. protons
An autosomal dominant trait
A) passes from mother to son only. B) skips generations. C) can be carried by unaffected individuals. D) can affect either sex.
The fundamental difference between an organism's genotype and its phenotype is that
A. the phenotype refers to all of the genetic material in the organism, whereas the genotype represents only the genetic material that is expressed into proteins. B. the genotype refers to eukaryotic genes that contain both introns and exons, whereas phenotype refers to bacterial DNA that has only exons. C. the genotype refers to all of the genetic material in the organism, whereas the phenotype represents only the genetic material that is expressed into proteins. D. the genotype refers to the organism's genes and the phenotype refers to the non-coding segments of DNA.