Which nucleic acid is a major part of ribosomes?
a. DNA
b. rRNA
c. mRNA
d. tRNA
e. RNA polymerase
ANSWER: b
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In the experiments constructed by Pasteur to disprove spontaneous generation, swan-necked flasks were used. Why was this shape of flask used in this experiment?
A. The shape of the glass neck allowed the bacteria into the flask and then into the media, but air could not enter. B. Because the glass necks were stretched out, the heat used to sterilize the medium inside of the flask could not kill the bacteria in the neck. C. The glass necks needed to be open to the air, yet constructed so that bacteria would settle in the lowest part of the neck. D. These flask shapes were the easiest and cheapest to produce.
Pre-cancerous and even early cervical cancer
a. can be removed if detected early enough. b. may be caused by HPV, a type of papillomavirus. c. can be detected by pap tests d. can often be prevented with a vaccine that can’t be used to treat the disease. e. include all of these.
Which of the following points to a recessive X-linked trait?
a. it is common in both men and woman
b. a carrier mother has the trait on both X chromosomes c. a carrier father carries two copies of the gene d. only a daughter can inherit a recessive allele from an affected father e. an affected daughter has the trait on one X chromosome
The hormone most directly responsible for inducing ovulation is _____.
A. progesterone B. fertilin C. luteinizing hormone D. follicle-stimulating hormone