Describe the mechanisms that lead to multiple births. What will be an ideal response?
Concepts to Consider: Monozygotic (identical) twins form when the cells of the two-celled
embryo separate and develop into complete organisms. They may also form when the inner
cell mass divides and forms two groups of cells, which both develop independently. If the
two inner cell masses do not separate completely, conjoined twins form. Dizygotic (fraternal)
twins develop when two eggs are ovulated and fertilized by different sperm.
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Polytene chromosomes form in some types of cells that
a. have a lot of chromosomes b. are making a lot of protein c. are differentiating d. are making a lot of protein and are differentiating
A fetus’s exposure to ____ is the leading preventable cause of birth defects
a. alcohol b. X-rays c. viruses d. thalidomide e. Toxoplasma gondii
Viruses are most closely related, in that they share a common ancestor, to which domain of life?
a. bacteria b. Viruses are not considered to be part of the tree of life. c. archaea
How does the amount of atp resulting from fermentation compare to that of aerobic respiration?
a) aerobic respiration results in less energy b) aerobic respiration results in more energy c) each process results in equal amounts of energy