Which of the following represents the correct sequence of events for sexual reproduction in most vertebrates?
A) mitosis ? zygote ? meiosis ? gametes ? embryo
B) meiosis ? zygote ? mitosis ? gametes ? embryo
C) mitosis ? gametes ? meiosis ? zygote ? embryo
D) meiosis ? gametes ? mitosis ? zygote ? embryo
E) meiosis ? gametes ? zygote ? mitosis ? embryo
Answer: E
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When Nitrobacter utilizes nitrite produced from ammonia by Nitrosomonas to obtain energy by converting the nitrite to nitrate, the relationship between the two organisms is
A. mutual. B. commensal. C. amensal. D. parasitic.
As a child, you received the OPV vaccine and its boosters. Now you are going on a mission trip to Pakistan, and the vaccine is recommended by the Centers for Disease Control and Prevention. When you go to the health office for the vaccine, they give you the IPV vaccine. When you ask why you are receiving the IPV rather than the OPV, the personnel explain that
A. IPV is used as a booster only, and OPV is used exclusively for children's first immunization. B. the IPV has fewer active viruses in it than the OPV, so it is safer. C. the IPV is preferred by patients because it can be taken orally. D. there is no possibility of actually developing polio from this vaccine.
Which organism comprises the largest and bottom base level of the trophic pyramid?
A) decomposers B) producers C) primary consumers D) secondary consumers
Suppose that a man and woman have a son with a rare genetic disorder known to be X-linked. There is no occurrence of the disorder on the woman's side of the family, but the man's brother has it, as does her father. What is the probability that the son's defective allele came from the man?
a. 0% b. 25% c. 50% d. 100%