As the period of fetal growth comes to an end, a steep rise in ____ levels directly causes ____
a. progesterone; uterine cells to express oxytocin receptor genes
b. progesterone; uterine contractions
c. estrogen; uterine cells to express oxytocin receptor genes
d. estrogen; uterine contractions
e. estrogen; oxytocin production
ANSWER: c
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The plant alkaloid ricin is nontoxic inside castor beans, but becomes active when digested by an animal. The toxic form of ricin kills by
A. inactivating ribosomes needed for translation. B. inactivating the animal's immune system. C. releasing cyanide. D. over stimulating the animal's heart rate. E. binding to RNA polymerase.
Which one of the following statements is true of the 32 allele in the CCR5 gene? (Choose all that apply)
A. It codes for a mutant protein that is completely inactive. B. It leads to a deletion which maintains the reading frame. C. It provides some protection against HIV progression to AIDS in both its heterozygous and homozygous forms. D. It is an example of a beneficial mutation. E. It affects the attachment of HIV to an animal cell by altering one of the viral proteins.
A(n) threatened species is a species in imminent danger of extinction
___________________ Indicate whether the statement is true or false.
Discuss the evolutionary 'pros and cons' of animals living in groups. Name three animal behaviours are necessary for group living? For each behaviour, describe the governors of behaviour that may result in group living
What will be an ideal response?