Oxygen-16 is abundant and has 8 protons and 8 neutrons. Oxygen-18 has two extra neutrons. These two forms are:
A. oxygen ions.
B. oxygen dimers.
C. oxygen isomers.
D. oxygen isotopes.
D
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If Mendel crossed two homozygous recessive green peas (yy) together, what percentage of offspring would also be homozygous recessive?
a. 0% b. 50% c. 75% d. 100%
What are plasmids?
A. Small, circular RNA molecules that contain many genes but that cannot be passed on to other bacteria B. Small, circular DNA molecules that contain just a few genes and that can be passed on to other bacteria C. Small, circular RNA molecules that contain just a few genes and that can be passed on to other bacteria D. Small, circular DNA molecules that contain just a few genes but that cannot be passed on to other bacteria
The fundamental unit of taxonomic classification is the ________.
Fill in the blank(s) with the appropriate word(s).
Amniocentesis and chorionic villus sampling allow for ________ and ________ of the fetus so that it can be tested for abnormalities
A) imaging; karyotyping B) sexing; imaging C) karyotyping; biochemical testing D) direct observation; biochemical testing