Of the following, the best way to separate the effects of genes and environment in research is to study
a. identical twins
b. adopted children and their adoptive parents
c. fraternal twins
d. identical twins raised in different environments
Ans: d. identical twins raised in different environments
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Which of the following statements is FALSE?
A) When plant cells are growing, they release expansins, which are enzymes that can expand the primary cell wall. B) The secondary cell wall often contains structural components, like lignin, that form a relatively rigid and complex network within the cell wall. C) A plant cell continues growing after the secondary cell wall forms but stops growing with the formation of the tertiary cell wall. D) Pectin is a component of the cell wall that attracts and holds water.
Which of the following is contained in the semen?
a. a substance that raises the pH in the female reproductive tract b. a substance that triggers contraction of muscles in the female reproductive tract c. a fast-acting enzyme that breaks down the semen clot d. a slow-acting clotting enzyme
Which of the following is NOT usually considered a mutation?
a) DNA methylation taking place on a CpG site that formerly was un-methylated b) Translocation whereby a region of chromosome 8 is swapped with chromosome 14 c) Shortening of a micro satellite repeat in the exon of a gene during mitosis d) A change in the base sequences of DNA
Ultraviolet light penetrates (more/less) effectively than gamma rays
What will be an ideal response?