A microbiologist explains to one of her biology classes that her research focuses on the nucleoid region of the cholera bacteria. This means that she is studying a region within the bacterium that contains the
A. R plasmids.
B. peptidoglycan.
C. nucleic acids.
D. nuclear membrane.
Answer: C
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Why should scarring of a fallopian tube raise the risks of an ectopic pregnancy?
A. Scarring may slow the progression of the ovum (egg) from the fallopian tubes into the uterus. If it is fertilized by a sperm cell while it is stopped in the fallopian tube, it may implant there, resulting in an ectopic pregnancy. B. Scarring can completely block the ovum (egg) from being able to exit the fallopian tube to enter the uterus. It may implant in the wall of the fallopian tube (since it can't enter the uterus) and result in an ectopic pregnancy. C. Scarring may allow the sperm cells to enter the fallopian tubes and bind to the scar tissue. The inflammatory response generated when this occurs is termed an ectopic pregnancy. D. Scarring of the fallopian tubes results from undiagnosed bacterial infections. These bacteria can also make the lining of the uterus inhospitable to implantation of a fertilized egg. If the fertilized egg can't implant into the wall of the uterus, it may travel back into the fallopian tube and implant there instead, resulting in an ectopic pregnancy.
What processes cause the difference in appearance between gas tails and dust tails in comets?
What will be an ideal response?
Frogs and toads belong to which of the following lineages?
a. Caudata b. Aves c. Squamata d. Gymnophiona e. Anura
Which of the following is (are) fixed action
pattern(s)? a. A baby garter snake captures and eats a slug. b. A chick’s gaping mouth induces a feeding response in a parent bird c. A European cuckoo hatchling pushes the host bird’s egg out of the nest. d. A male fruit fly waves his wings at a female fruit fly during courtship. e. All of these are fixed action patterns.