Plants that are adapted to growing in flooded soils that are depleted of oxygen have:a
aerial roots.
b. contractile roots.
c. pneumatophores.
d. prop roots.
e. buttress roots
c
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Virion size ranges from
A. 1-40 nm. B. 600-1,000 nm. C. 10-400 nm. D. 1,000-10,000 nm.
Cystic fibrosis (CF) is an autosomal recessive disorder caused by faulty chloride ion channels in cells lining of the lungs and the pancreas. A man and woman, with no CF symptoms, have an unaffected boy and a daughter with CF. The gene responsible for CF is located on:
a. The X-chromosome b. The Y-chromosome c. One of the human chromosomes 1=12
What is the outcome of F+ X F- conjugation?
a. The F- cell receives a copy of the F factor and becomes an F+ cell. b. The F- cell receives a copy of the F factor but remains an F- cell. c. Chromosomal DNA is transferred from the F+ cell to the F- cell. d. Chromosomal DNA is transferred from the F- cell to the F+ cell. e. A genetic recombination of bacterial genes takes place.
DNA polymerase assembles new strands
a. in a 5' to 3' direction only. b. in a 5' to 3' direction building one strand and a 3' to 5' direction building the other stand. c. in a 5' to 3' direction building the first half of a strand and a 3' to 5' direction building the second half of a strand. d. in a 3' to 5' direction building the first half of a strand and a 5' to 3' direction building the second half of a strand. e. in a 3' to 5' direction on the “old” 3' to 5' strand.