Cells become progressively organized into recognizable structures through a process known as:
a. morphogenesis.
b. determination.
c. cell differentiation.
d. pattern formation.
e. growth.
a
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In the accompanying figure, why does the curve sharply drop after approximately 45°C instead of mirroring the slope
of the line going from 0-40°C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful or required. b. This is true of all catalysts and is not due to any special features of enzymes.
c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and diminishes the enzyme's activity. d. The kinetic energy of the reactants is lower than that of the products, forcing a change in enzyme activity. e. The enzyme begins to denature above a certain temperature, eliminating all catalytic activity of the protein.
What is the primary original source of genetic variation in a population?
A) mutation B) genetic drift C) blending inheritance D) cloning
In the female, __________ stimulates follicle maturation
a. GnRH b. LH c. FSH d. estrogen e. progesterone
Alterations to the positioning of the testes in males serve the purpose of ________
A) adjusting the temperature needed for production of healthy sperm B) allowing for an erection to occur C) allowing more room for the urethra D) allowing glands to release their contents