All of the following statements about ferns are correct except
A. ferns flourish in many habitats, but the majority are located in the tropics.
B. the sporophyte is a conspicuous generation.
C. the gametophyte is a conspicuous generation.
D. ferns have underground stems called rhizomes.
E. sori are located on the back or ventral surface of fronds.
C. the gametophyte is a conspicuous generation.
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The lowest level of biological organization that can survive and reproduce is the ____
a. cell b. tissue c. proton
d. nucleus e. DNA
The base that is not found in DNA, but only in RNA is ________.
A. adenine B. guanine C. uracil D. thymine
A breeder of cattle has a herd of white cows and a roan bull. Hair color in this breed is controlled by an incompletely
dominant gene. The two homozygous forms are either red or white, and the heterozygous is roan. (a) What colors of calves are expected and in what proportions? (b) Outline a procedure to develop an all-red herd. What will be an ideal response?
In 1964, Nirenberg and Leder used the triplet binding assay to determine specific codon assignments. A complex of which of the following components was trapped in the nitrocellulose filter?
A) sense and antisense strands of DNA B) charged tRNA, RNA triplet, and ribosome C) ribosomes and DNA D) uncharged tRNAs and ribosomes E) free tRNAs