A pollen tube together with its contents of male gametes constitutes the ____
a. male reproductive organ
b. endosperm mother cell
c. mature male sporophyte
d. immature male gametophyte
e. mature male gametophyte
ANSWER: e
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Which of the following bacterial hosts would should be used to avoid degradation of DNA that is introduced via a cloning vector?
A. Escherchia coli RecA mutants B. Saccharomyces cerevisiae wild type cells C. Escherichia coli that lack endonucleases D. RecA-expressing Escherchia coli
Match the type of microscopy with the appropriate characteristic.
A) uses a laser to view a single plane of a specimen B) detects electrons passing through a specimen C) light passes directly through specimen D) detects electrons deflected from the surface of the specimen E) shows specific molecules F) amplifies variations in density 1) Brightfield 2) Fluorescence 3) Phase-contrast 4) Confocal 5) Transmission electron microscopy 6) Scanning electron microscopy
Sediments that are composed of the remains of once living organisms are called:
a. cosmogenous. b. hydrogenous. c. inorganic.. d. biogenous. e. terrigenous.
What is the maximum number of single covalent bonds a carbon atom can form with other elements?
A) 1 B) 2 C) 3 D) 4