What is the general name given to the most highly condensed form of chromatin?
A. X chromatin
B. euchromatin
C. 30-nm chromatin fiber
D. nucleosome
E. heterochromatin
Ans: E. heterochromatin
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Select the correct meaning for the following pedigree symbol.
A) Unaffected male
B) Unaffected female
C) Mating
D) Affected male
E) Affected female
The embryonic skeleton consists of
a. bone and ligaments. b. cartilage and tendons. c. cartilage and membranes. d. cartilage and ligaments. e. bone and membranes.
An advantage of chorionic villus sampling (compared with amniocentesis) is that:a
chorionic villus sampling detects a much wider range of genetic defects than does amniocentesis. b. chorionic villus sampling is much less expensive than is amniocentesis. c. chorionic villus sampling is much less invasive than amniocentesis. d. chorionic villus sampling is much easier to perform than amniocentesis. e. chorionic villus sampling can be performed much earlier than can amniocentesis.
Your professor brings in a soybean plant that he uprooted from nearby. Small growths on the roots are stained to show bacteria. Your professor explains the bacteria can "fix" nitrogen into a usable form for the plant. The growths are called
A. root hairs. B. nodes. C. sieve tubes. D. nodules. E. internodes.