In the remaining megaspore, three rounds of mitosis with no cytoplasmic division result in a single cell with ____ haploid nuclei
a. three
b. four
c. six
d. eight
e. twelve
d
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The reason some individual hormones have multiple effects on different target tissues is that ____
a. gene transcription is altered b. second messengers trigger cascade or amplification effects c. many different cells in different tissues have specific receptors for the hormone d. only a small amount of the hormone is required for its effect e. hormones can conform to multiple receptors
All of the following pertain to cephalosporins, except
A. many are administered by injection, not orally. B. they have a beta-lactam ring. C. newer generations have activity against gram-negative bacteria. D. they have greater resistance to beta-lactamases. E. they are are synthetic drugs.
A solution with a pH of 3
A) is more alkaline than a solution with a pH of 2. B) has a higher concentration of OH- than a solution with a pH of 4. C) is neutral. D) is more acidic than a solution with a pH of 3.5.
The fungi that cause serious plant disease, such as Dutch elm disease and chestnut blight, belong to the phylum
A. Glomeromycota. B. Actinomycetes. C. Ascomycota. D. Basidiomycota. E. Zygomycota.