What type of cell communication is said to occur if a cell secretes a growth factor that then acts on neighboring cells to cause them to proliferate?
A. contact-to-contact signaling
B. intercellular signaling
C. autocrine signaling
D. paracrine signaling
E. endocrine signaling
D. paracrine signaling
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Which of the following cannot be addressed directly using biotechnology?
a. determining DNA profiles from a crime scene b. inserting a gene into a person to replace a defective gene c. examining the moral implications of inserting pesticide genes into crop plants d. using bacteria to produce products such as insulin and human growth hormone
The skin of sharks is covered with scales called:
a. placoid. b. cycloid. c. ctenoid. d. ganoid. e. circular.
If a daughter expresses an X-linked recessive gene, she inherited the trait from
a. her mother. b. her father. c. both parents. d. neither parent. e. her grandmother.
The ABC genes in the model of Arabidopsis flower development are organ-identity genes that arealso:a
segmentation genes. b. homeotic genes. c. gap genes. d. translation factors genes. e. growth factor genes