What is the composition of the "halves" of an individual peanut, which constitute the largest part of the seed, and are called cotyledons?
a) triploid endosperm cells
b) haploid endosperm cells
c) diploid embryo sporophyte cells
d) diploid maternal sporophyte cells
e) diploid gametophyte cells
Answer: a) triploid endosperm cells
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Which statement is false?
a. A molecule is made of at least two atoms. b. Compounds are made of elements. c. Two atoms of oxygen make a molecule of oxygen. d. Proportions of elements in compounds vary according to their source in nature. e. Elements are found in compounds and molecules.
Which of the following types of membrane proteins are responsible for conveying external messages such as those sent by a hormone signal?
A) Recognition proteins B) Receptor proteins C) Connection proteins D) Transport proteins E) Enzymes
Suppose this experiment was repeated two weeks in a row. Each time the same person was the hand scrubber and the procedure was repeated exactly the same. Would you expect the number and kinds of microorganisms present in the first hand scrub (A) or the last hand scrub (E) to be similar from week to week?
A) I would expect the number and kinds of microorganisms present in the first hand scrub (A) to be similar from week to week. B) I would expect the number and kinds of microorganisms present in the last hand scrub (E) to be similar from week to week. C) Neither choice (scrub A or scrub E) would be similar from week to week.
Which of the following is a group of parasitic flatworms?
A) leeches B) flukes C) nematodes D) sea anemones E) annelids