The earliest discovered fossils are of ____ dating back to ____ years ago
a. single celled eukaryotes...4.5 billion
b. prokaryotes...3.5 billion
c. algae...1.8 billion
d. fish...600 million
e. dinosoaurs...65 million
Ans: b. prokaryotes...3.5 billion
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You are asked to study a new species, and you are presented with a miniscule amount of DNA from that species. If you do not find a way to increase the volume of the DNA sample, you will not be able to work with the sample at all. which of these techniques amplifies DNA?
A. electrophoresis. B. PCR. C. DNA fragmentation. D. cladistics.
What is occurring in step 2?
a. mitosis b. the first meiotic division c. the second meiotic division d. fertilization e. fusion
If two genes are not linked, then the expected phenotypic ratio resulting from a testcross is
A) 9:3:3:1. B) 1:2:1. C) 3:1. D) 1:1:1:1. E) 1:1.
During which one of the following phases of the cell cycle does the nucleus divide?
A) G2 phase B) interphase C) S phase D) late into G0 E) mitotic phase