A callus is a mass of bone and cartilage that
A) is a form of bone cancer.
B) thickens the fibrous structure of a muscle.
C) forms after a bone breaks.
D) is involved in bone formation in the vertebrate embryo.
C
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If any of the traits that Mendel worked with had been due to linked genes, his dihybrid crosses would have
A. produced more offspring. B. produced less offspring. C. exhibited a typical phenotypic ratio of 9:3:3:1. D. produced sterile offspring. E. had different results.
With regard to photosynthesis, photorespiration ____
a. is more efficient in producing carbohydrates b. predominates in C3 plants in cool weather when water is plentiful c. predominates in C4 plants on hot days d. produces the same amount of PGA e. is less efficient in producing carbohydrates
Semilunar valves prevent blood from flowing ________.
Fill in the blank(s) with the appropriate word(s).
What is found between the primary walls of adjacent cells for cells to adhere tightly to one another?
a. collagen b. cytosol c. middle lamella d. secondary cell wall e. intermediate filaments