Bryophytes differ from other plant groups because __________.
a. their gametophyte generation is dominant
b. they lack gametangia
c. they have flagellated sperm
d. they are not embryophytes
e. All of the listed responses are true.
Answer: a. their gametophyte generation is dominant
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Loeffler's medium inhibits the growth of MOST organisms and is commonly used to cultivate
A) Corynebacterium diphtheriae. B) Mycobacterium tuberculosis. C) Mycobacterium leprae. D) Staphylococcus aureus.
You're a famous eye surgeon, specializing in corneal transplants. Give your choice, would you rather have a cornea for transplantation from a 20 year old individual, or a 60 year old individual (assuming there are no optical defects due to age), and why?
A. The 60 year old-clearly, if the individual has gone 60 years with no optical defects, this is a very good organ for transplantation. The 20 year old cornea may have defects that simply haven't become apparent yet. B. The 20 year old cornea-younger is always better when dealing with tissue transplants. You want to give the transplant the longest possible time for survival in the recipient. C. The 20 year old cornea-while extremely rare, it may be possible to transmit prions through corneal transplants. It's less likely that a 20 year old would have encountered and become contaminated by prions than the 60 year old. D. The 20 year old cornea-never mind prions, there are a variety of agents that can hide in corneal tissues and that might cause disease. It's far more likely that the 60 year old would be harboring one or more of these pathogens than the 20 year old.
Explain the genetic evidence for the evolutionary changes that caused the loss of forelimbs in snakes
What will be an ideal response?
Which of the following statements is correct?
A. Asexual reproduction requires the production of eggs and sperm. B. The sperm and egg have twice as many chromosomes as the parental cells. C. Geneticists use the terms "son" and "daughter" to distinguish between cells resulting from cell division. D. Meiosis results in gametes that are used in reproduction.