What would happen if human chorionic gonadotropin levels did not rise adequately during pregnancy? What will be an ideal response?
ANSWER: The role of human chorionic gonadotropin is to help retain the uterine lining by preventing
menstruation. If menstruation were allowed to occur due to low HCG, the fetus would be
lost.
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Chemical defenses are found only among animals.
Answer the following statement true (T) or false (F)
Measuring its costs and benefits in terms of energy spent and/or gained, which interaction involves one individual neither gaining nor losing? Select all that apply
A. competition B. predation C. obligate mutalism D. facultative mutalism E. commensalism
All of the following are true of the polymerase chain reaction (PCR) except:
A. A heat-stable DNA polymerase is used in the reaction process. B. Short pieces of DNA called primers are added to the reaction mixtures. C. Large amounts of DNA must be isolated from the source organism. D. Billions of copies of a DNA sequence are made in a few hours. E. An automated thermocycler is used to heat and cool the reaction samples
Which of the following is NOT found in the nucleus?
A. mitochondria B. nucleolus C. chromatin D. DNA