The term amniote refers to amphibians, reptiles, birds and mammals
a. true
b. false
Answer: b. false
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A high proportion of the food that cattle eat cannot be digested by cattle
a. True, cattle have large saclike pouches that house plant-digesting microbes. b. False, cattle are herbivores and thus produce the necessary enzyme to digest plant material. c. True, this is why cattle have to eat large amounts of food, because most passes undigested through their gut. d. False, cattle eat highly nutritious plants that are readily digested
In order to test a hypothesis, a scientist would measure which of the following during an experiment?
a. the independent variable b. the dependent variable c. the standard variable d. the constant
Swordtail fish are known for the long extensions on the males' tails. What types of experiments might help you determine whether the females are using visual input about tail length to choose between males? (Check the best three.)A) Add artificial tails of different lengths to females and determine their response to normal males.B) Add artificial tails of different lengths to male platys (a similar fish without tail extensions) and measure female response.C) Create artificial fish models with different size tails and measure female response.D) Measure hormone levels in males who have different size tails.E) Measure sperm count in males who have different size tails.F) Trim the tails of male fish to different lengths and measure female response.
What will be an ideal response?
Which of the following statements about tumor suppressor genes is false?
(a) Gene amplification of a tumor suppressor gene is less dangerous than gene amplification of a proto-oncogene. (b) Cells with one functional copy of a tumor suppressor gene will usually proliferate faster than normal cells. (c) Inactivation of tumor suppressor genes leads to enhanced cell survival and proliferation. (d) Individuals with only one functional copy of a tumor suppressor gene are more prone to cancer than individuals with two functional copies of a tumor suppressor gene.