Which procedure is the least-invasive method of assessing fetal health while development is still occurring?

A. amniocentesis
B. chorionic villus sampling
C. karyotyping
D. ultrasound


Answer: D

Biology & Microbiology

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All the cells in a cancerous tumor are ____________________ directly descended from one cell

Fill in the blank(s) with correct word

Biology & Microbiology

Part of a chromosome moves to another, nonhomologous chromosome during ____________________

Fill in the blank(s) with correct word

Biology & Microbiology

A change in the genetic makeup of a species over time is called

A) adaptation. B) mutation. C) evolution. D) natural causality.

Biology & Microbiology

The A159E mutation causes an A amino acid to be replaced with an E amino acid (their structures are shown here). What type of mutation is the A159E mutation?


A) missense mutation
B) silent mutation
C) frameshift mutation
D) nonsense mutation

Biology & Microbiology