Granulicatella spp. and Abiotrophia spp. are dependent on which nutritional additive for optimal growth?
a. Vitamin K
b. Vitamin B6
c. Vitamin B12
d. Vitamin D
B
Granulicatella spp. and Abiotrophia spp. are unable to multiply without the addition of 0.001% pyridoxal hydrochloride, also called thiol or vitamin B6 . These streptococci are known as nutri-tionally variant or satelliting streptococci and have been associated with bacteremia and endo-carditis.
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In guinea pigs coat color is determined by a single gene with two alleles. A guinea pig from a true-breeding black strain is mated with a guinea pig from a true-breeding white strain. The F1 progeny are all black. Two of the F1 progeny are mated with each other. What proportion of the F2 progeny is expected to be white?
a. 1/2 b. 1/3 c. 1/4 d. 3/4
If an allele masks the effects of another allele the masking one is referred to as being ________
a. recessive b. homozygous c. hybrid d. heterozygous e. dominant
In a honeybee society, the worker bees are all male. Indicate whether the statement is true or false
Which method of asexual reproduction would be most likely to occur in a wild population of plants? This method enables the parent plant to produce multiple offspring that start to grow away from the parent plant.
A. production of suckers from the parent plant B. growth of stolons C. growth of rhizomes D. The root develops slips which can produce new offspring.