Which of the following forms of energy is NOT one of those thought to have been involved in the production of large organic molecules in the primitive reducing atmosphere?
A. radioactivity
B. electrical energy
C. heat
D. radiation from the sun
E. sound
Ans: E. sound
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Which species is considered to be the most ancient?
a. Homo erectus b. Australopithecus afarensis c. Australopithecus sediba d. Homo sapiens e. Sahelanthropus tchadensis
Transposons, or jumping genes, are DNA elements that move within the genome. In which organismic groups are transposons found?
A) ancient bacteria B) mammals C) eukaryotes D) bacteria E) all organismic groups
Embryonic stem cells are different from primary cell cultures or permanent cell lines derived from a tissue in that they are capable of
a. generating many cell types. b. growing and dividing. c. synthesizing their own DNA. d. transporting nutrients across their plasma membrane.
Why is reduction the term used to describe the gain of an electron?
a. The electron acceptor's net charge decreases. b. The number of molecules in the reaction decreases. c. The amount of energy in the molecule decreases. d. The electron acceptor gets smaller.