Down syndrome results from the inheritance of
a. only one copy of chromosome 21.
b. no copies of chromosome 21.
c. an extra copy of chromosome 21.
d. two copies of chromosome 21.
Answer: c. an extra copy of chromosome 21.
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Which element is considered an essential micronutrient for plants?
a. zinc b. potassium c. hydrogen d. arsenic e. platinum
In eukaryotes the DNA molecule that makes up a chromosome is typically ____ and usually has ____
replication origin.
a. circular; one b. circular; more than one c. linear; more than one d. linear; one e. linear; no
Chlorine has an atomic number of 17 and an atomic mass of 35. Therefore, chlorine has ________ electrons and ________ neutrons
A) 17; 18 B) 18; 17 C) 17; 35 D) 35; 17 E) 18; 18
Explain how a complex trait, such as eyes or the ability to fly, can evolve by incremental modifications over time
What will be an ideal response?