Briefly explain the formation of bone in the human body
What will be an ideal response?
The fetal skeleton is first made of cartilage. Cartilage is strong and flexible, and the cartilage cells are able to divide and grow as the fetus grows. During the third month of fetal development, osteoblasts begin to form a collar around the long bones in the fetus. The osteoblasts form from cartilage cells that are transformed as blood vessels form around the cartilage. These osteoblast collars support the bones as the cartilage inside breaks down, leaving a cavity inside. The cavity is filled with hollow space that the osteoblast cells fill with spongy bone. The osteoblasts secrete collagen and other organic material, which then mix with calcium salts to form mature bone cells called osteocytes that are unable to divide. The epiphyseal plates form at the end of the long bones, and the long bones are able to grow from these structures.
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Temperature is important for organisms because
A. it affects the rate of biochemical reactions. B. it affects the fluidity and rigidity of plasma membranes. C. high temperatures can damage enzymes. D. it affects metabolic rates and energy expenditure. E. All the choices for this question are correct.
Explain how proteomics is considered by some to be even more important than genome sequencing
What will be an ideal response?
Is the number of chromosomes in each cell of an organism a good indicator of the complexity of that organism?
A. It depends on the type of cells of the organism. B. Yes, the number of chromosomes indicates how complex an organism is. C. Yes, the number of chromosomes is a good indicator of an organism's complexity, but the amount of DNA matters even more. D. No, the number of chromosomes does not indicate how complex an organism is.
Which of the following contributes to the semen?
A. penis B. bulbourethral gland C. epididymides D. urethra E. vas deferens