Primary tissue layers form by cell divisions, cell
migrations, and rearrangements at this stage.
a. A
b. B
c. C
d. D
e. E
Answer: c
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Which of the following are most susceptible to complement lysis?
A. Gram-positive bacteria B. Gram-negative bacteria C. Bacteriophages D. Prions
What is unique about reverse transcripatse that makes it different from other DNA polymerases?
A. It has ligase ability built in so host enzymes are not needed to seal up breaks in DNA made during replication. B. It manufactures a special tRNA molecule that it uses as a primer to initiate replication. C. It is found exclusively in DNA viruses. D. It lacks normal proofreading ability leading to many errors during replication.
If Andrew has indeed inherited the Huntington's allele from his mother, what are the chances that he could pass the allele to his children?
a. 1 in 4 (25%) b. 2 in 4 (50%) c. 3 in 4 (75%) d. 4 in 4 (100%)
Research on speciation of Hawaiian crickets, shown in the accompanying figure, has led researchers to conclude that ________
A) these cricket species have diverged by a mechanism known as assortative mating B) females of different species have strong preferences for the singing pulse rate of the males of their own species C) female preference for male singing pulse rate is genetically linked to the combination of genes regulating the singing pulse rate of males D) All of the above are accurate.