In a seed plant, the pollen grains are actually tiny
A. male gametophytes.
B. eggs.
C. seeds.
D. female gametophytes.
Answer: A
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Which of the following statements about the life cycle of a crab is true? a. Most species of crab are hermaphrodites
b. A female crab hides fertilized eggs under a rock in a sheltered spot and guards them until they hatch. c. A crab larva will molt as it grows. d. Young crabs look like miniature adults as soon as they hatch from their eggs.
Anticodons pair with
a. codons on DNA b. codons on mRNA. c. codons on tRNA d. codons on rRNA e. messenger RNA and ribosomal RNA.
Biological growth involves an increase in:
a. the number of cells. b. the size of individual cells. c. the number of gene types in a cell. d. both the number and size of cells. e. both the number of cells and the number of gene types in a cell.
Amniocentesis is _____.
A. a surgical means of repairing deformities B. a form of chemotherapy that modifies or inhibits gene expression or the function of gene products C. used in prenatal diagnosis to detect chromosomal mutations and metabolic disorders in embryos D. a form of gene replacement therapy E. commonly performed on newborns