New alleles arise by _____
a. crossing over
b. mutation
c. independent assortment
d. sexual reproduction
e. asexual reproduction
ANSWER: b
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The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a mistake in which of the following
A) mitosis in her ovary B) metaphase I of one meiotic event C) telophase II of one meiotic event D) telophase I of one meiotic event E) either anaphase I or II
Prevents supercoiling ahead of the replication fork
A. DNA ligase B. DNA primase C. Topoisomerase D. DNA polymerase I E. DNA polymerase III
Which technology was first established by Cro-Magnon?
Select one: a. throwing spears b. scrapers c. controlled fire d. group life e. All of the answer choices are correct.
The two chains of nucleotides in a DNA molecule are held together by:
A) covalent bonds. B) ionic bonds. C) hydrogen bonds. D) hydrophobic interactions. E) peptide bonds.