Seedless vascular plants were the dominant plants on Earth until their dominance ended at the end of the
Carboniferous period, about ____.
a. 1.5 billion years ago
b. 420 million years ago
c. 250 million years ago
d. 125 million years ago
e. 17 million years ago
ANSWER: c
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The frequency of recombination during meiosis is a function of:
A. the alleles on the genes; recombination happens less frequently among recessive alleles. B. the distance between genes: the closer the genes are, the more frequent the recombination between them. C. the distance between genes: the farther apart the genes are, the more frequent the recombination between them. D. whether or not the genes are sex-linked; X chromosomes recombine much more frequently than do autosomes. E. whether or not the genes are sex-linked; Y chromosomes recombine much more frequently than do the autosomes.
The acrosomal reaction is the ____
a. activation of a sperm cell through attachment of an acrosome b. release of digestive enzymes from the acrosome after the initial attachment of a sperm to an egg c. fusion of sperm and egg nuclei using enzymes from the acrosome d. use of enzymes from the acrosome to block the attachment of other sperm cells to the egg e. initial binding of the sperm to the zona pellucida
An anticodon has the sequence GCG. What amino acid does this tRNA carry? What would be the effect of a mutation that changed the C of the anticodon to a G?
What will be an ideal response?
Which phrase best describes the term genome?
A.) the genetic makeup of a chromosome B.) the genes that make up an organism C.) the location of a specific set of genes D.) the sum of an organism's physical traits