Human traits are controlled only by the genetic material found in the 46 chromosomes
a. True
b. False
False
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Severe physical impacts on a habitat are called ____
Fill in the blank with the appropriate word.
White flower color is recessive to purple. What is the genotypic ratio when two heterozygous pea plants are crossed?
A. 1:1 B. 3:1 C. 4:0 D. 2:1 E. 1:2:1
The human body's arterial blood pH is tightly maintained around 7.4 by buffering agents that bind hydrogen ions to stop any change in pH. If an acid-base imbalance overcomes the buffer system, the body changes the ventilation rate, or the rate at which gas enters or leaves the lungs. Changing the ventilation rate changes the concentration of CO2 in the blood, which alters the pH of the blood. In this case, the muscles that control the ventilation rate are acting as the:
A. homeostatic challenge. B. effector. C. sensor. D. set point. E. integrator.
The organisms that cause ringworm, or tinea, use keratin protein as their growth substrate. This is why these infections
A. have a high mortality rate. B. cause a discoloration of the skin by damaging skin pigment protein. C. produce a rash all over the body during an infection. D. are restricted to superficial skin layers.