Osteogenesis imperfecta is a rare human condition caused by a mutation in a gene encoding Type I collagen. In some forms of the disease, the mutation leads to the production of procollagen that has a defective extension sequence; this defect interferes with the assembly of functional collagen fibers. Which of the following symptoms would you expect to see in individuals with osteogenesis imperfecta?
A. thin discs between vertebrae
B. defective kidneys and capillaries
C. very strong tendons and ligaments/tight joints
D. very weak bones
E. respiratory problems/lung defects
Answer: D
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Chlorophyll b absorbs green wavelengths of light that chlorophyll a cannot absorb. In this respect, chlorophyll b acts as
A. an accessory pigment. B. an energizer for photosynthetic bacteria. C. a light absorber in the green light. D. a more efficient pigment.
Like other members of their phylum, jellyfishes have specialized stinging cells called ____ as part of their epidermis,
which they use to paralyze small prey.
a. choanocytes b. polyps c. cnidocytes d. flame cells e. tentacles
Which of the following statements is false? a. Blood circulates faster through a fish than through a human. b. Fish have only a two-chambered heart, but humans have a four-chambered heart fully partitioned into two halves. c. Humans
have pulmonary capillaries for uptake
of oxygen, whereas fish have gill capillaries for
this purpose.
d. Blood pressure is lower in the capillary beds
than in the arteries serving them.
e. The circulation of blood in humans is more
efficient than in fish.
In a pedigree, a person whose symbol is filled in and who is associated with the roman numeral II
_____. A. is affected by the trait and in the second generation B. is not affected by the trait and in the second generation C. is affected by the trait and is the second-oldest child in the family D. is not affected by the trait and is the second-oldest child in the family E. is affected by the trait and has an identical twin