Sugars can cyclize if they contain _______ or more carbons.
a. four
b. five
c. six
d. eight
Ans: b. five
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Which of the following is not a characteristic of an autosomal recessive disorder pedigree?
A. Affected children can have unaffected parents. B. Both males and females are affected with equal frequency. C. Two affected parents will always have affected children. D. Affected individuals with homozygous unaffected mates will have unaffected children. E. Heterozygotes have an affected phenotype.
Nervous tissue is composed of neurons and ____________________, which support and nourish neurons. Fill in the blank(s) with the appropriate word(s)
Which of the following is not true about ferns?
a. their gametophytes and sporophytes are both photosynthetic b. their sporophytes are much smaller than the gametophytes c. their underground stem is called a rhizome d. their leaves are called fronds e. clustered, stalked sporangia called sori arise on the backs of the fronds
Which of the following will occur when a plant is placed into a hypotonic solution?
A. It will wilt. B. Some of its cells will burst. C. Turgor prevents more water from entering the cells. D. Water is actively pumped out of the cells. E. Elastic fibers in the cell walls enable plant cells to stretch and accommodate more water.