Hydrothermal vents are associated with the newest
theory on early cell evolution. Which of the
following is a true statement?
a. Synthesis of organic material occurs in
superheated mineral rich water.
b. Iron-sulfide molecules may act as cofactors for
organic material production.
c. Rock formed under these conditions has small
pits about the size of an average cell.
d. Under these conditions iron sulfide would
donate hydrogen to carbon dioxide to form
organics.
e. All of these are true.
Answer: e
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Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA?
A) 5'-purine-pyrimidine-purine-pyrimidine-3' with 3'-purine-pyrimidine-purine-pyrimidine-5' B) 5'-AGCT-3' with 5'-TCGA-3' C) 5'-GCGC-3' with 5'-TATA-3' D) 5'-ATGC-3' with 5'-GCAT-3' E) All of these pairs are correct.
Why have scientists developed classification systems?
a. To arrange living and dead organisms into groups reflecting their relationships and evolutionary origins. b. To make sense of the past and present diversity of life on Earth. c. To help scientists distinguish two different groups of organisms with the same common name. d. To arrange living and dead organisms into groups that reflect their relationships and evolutionary origins and to make sense of the past and present diversity of life on Earth. e. To arrange living and dead organisms into groups that reflect their relationships and evolutionary origins, to make sense of the past and present diversity of life on Earth, and to help scientists distinguish two different groups of organisms with the same common name.
A rapid, powerful movement of short duration that could not be sustained for long would likely
involve mainly
a. fast anaerobic fibers. b. fast aerobic and fast anaerobic muscle fibers. c. slow muscle fibers and fast aerobic muscle fibers. d. slow muscle fibers. e. fast aerobic fibers.
The most important role of meiosis in sexual reproduction is
What will be an ideal response?