All of the following are ways cancer cells avoid growth and invasion restriction imposed by the immune system except
A) they are heterogeneous groups of cells.
B) cancer cells often respond to density-dependent growth factors.
C) some cancer cells produce leukotoxins.
D) some cancers often "hide" in dense supporting tissue.
E) some cancers produce low levels of surface antigens.
B) cancer cells often respond to density-dependent growth factors.
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Whales use sound to
a. communicate. b. locate food. c. map out their surroundings. d. communicate and map out their surroundings. e. do all of these.
Which of the following is TRUE at the end of
telophase I in corn (20 chromosomes)? a. Each cell has 10 chromosomes. b. Each chromosome is double-stranded. c. Centromeres connect sister chromatids. d. Each cell has 10 chromosomes, and each chromosome is double-stranded. e. Each cell has 10 chromosomes, each chromosome is double-stranded, and centromeres connect sister chromatids.
DNA coding regions that affect the same trait are called
a. homologues. b. alleles. c. autosomes. d. loci. e. gametes.
The rate of fertilization increases with the time that a male spends mating.
a. true b. false